Lesson 7.6Determine Distance on the Coordinate Plane
Start hereWords, worked example, and sentence starters
Learning target I can find the distance between two points on the coordinate plane using absolute value.
Why This Matters Captain Vega has two treasure locations on her map: a buried chest at (-3, 2) and a hidden cave at (4, 2). Both are at the same height (y = 2) on the map. She needs to figure out how far apart they are so she knows how much rope to bring. Another pair of treasures is at (1, -3) and (1, 5) — same column, different rows. How far apart is each pair?
Start hereWords for this lesson
Read each word before you begin. Say it out loud.
| Word | What it means | Example |
|---|---|---|
| DistanceSpanish: Distancia | How far apart two points are. It is never negative. | always a positive length |
| Absolute valueSpanish: Valor absoluto | How far a number is from zero. It is never negative. | |−7| = 7 |
| Horizontal distanceSpanish: Distancia horizontal | How far apart two points are going left or right. | uses the x-coordinates |
| Vertical distanceSpanish: Distancia vertical | How far apart two points are going up or down. | uses the y-coordinates |
| Coordinate planeSpanish: Plano cartesiano | A grid with a line going across and a line going up to plot points. | x-axis across, y-axis up |
| IntegerSpanish: Número entero | Whole numbers and their opposites, like -2, -1, 0, 1, 2. | ..., -3, -2, -1, 0, 1, 2, 3, ... |
How it worksWorked example
These numbers are not on your problems. The steps are. Follow them with your own numbers.
Each unit is 1 meter. Find the distance from P(−9, 4) to Q(3, 4), and from P to R(−9, 11).
- P and Q share y = 4, so use x. −9 and 3 have opposite signs: 9 + 3 = 12 m.
- P and R share x = −9, so use y. 4 and 11 are both positive: 11 − 4 = 7 m.
Answer: PQ = 12 m and PR = 7 m
Now you trySame steps, your turn
The steps are the same as the worked example. The numbers are yours. Do the work.
Now let's find the distance from (2, 3) to (2, 8). What do these points share? The same x = 2, so it is a vertical line.
Say it and write itSentence starters
Finish each sentence out loud with a partner. Then use them in your writing.
- The two points share the -coordinate, so the segment runs .
- I used absolute value because .
- The points sit on sides of the axis, so I the two distances.
- The distance is units, which means on this map.
Word bank distanceabsolute valuehorizontalverticalcoordinate planeaxisunitsaddsubtractx-coordinatey-coordinatesegment
Watch out!A common mistake
A common mistake in Distance on the Coordinate Plane is subtracting the coordinates as if both points were on the same side of zero, instead of adding their absolute values when the points are on opposite sides. For example, to find the distance between (-6, 3) and (2, 3), a student might subtract 6 − 2 = 4, but since -6 and 2 are on opposite sides of zero, the absolute values must be added instead: |-6| + |2| = 6 + 2 = 8. The correct distance is 8 units, not 4. Before you submit, ask: 'Are these two points on opposite sides of zero
Lesson 7.6Determine Distance on the Coordinate Plane
Version ASupported practice
Learning target I can find the distance between two points on the coordinate plane using absolute value.
Why This Matters Captain Vega has two treasure locations on her map: a buried chest at (-3, 2) and a hidden cave at (4, 2). Both are at the same height (y = 2) on the map. She needs to figure out how far apart they are so she knows how much rope to bring. Another pair of treasures is at (1, -3) and (1, 5) — same column, different rows. How far apart is each pair?
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1Complete the table. Show how you found each value.
Both points in each row share a coordinate. Find the distance.
Point 1 Point 2 Shared Coordinate Distance (-5, 1) (3, 1) y = 1 (2, -4) (2, 6) x = 2 (-3, -2) (-3, 4) x = -3 (-1, 5) (4, 5) y = 5 Hint Each row shares a coordinate, so every distance is a straight horizontal or vertical count.
Show your work -
2Mark and label each value on the number line.
Plot -4 and 2 on the number line. Count the distance between them.
Hint Distance is the number of unit hops between the two points — direction doesn't matter.
Show your thinking
-
3Circle the letter of the best answer. Show how you know.
What is the distance between (-4, 3) and (2, 3)?
- A2 units
- B4 units
- C6 units
- D8 units
Hint Both points have y = 3, so they sit on the same horizontal line — only the x-values differ.
Show your work -
4Circle the letter of the best answer. Show how you know.
What is the distance between (5, -2) and (5, 4)?
- A2 units
- B4 units
- C6 units
- D10 units
Hint Both points share x = 5 — the segment is VERTICAL, so compare the y-values -2 and 4.
Show your work -
5Circle the letter of the best answer. Show how you know.
A rectangle has vertices at (1, 1), (5, 1), (5, 4), (1, 4). What is its perimeter?
- A8 units
- B12 units
- C14 units
- D20 units
Hint Perimeter is the distance all the way around — you need the width AND the height first.
FormulaPut the numbers inWork it outAnswer with its unit- 1Name itWhich measure is asked?
- 2Write the formulaBefore any numbers.
- 3SubstituteMatch each letter.
- 4Unitunits, sq units, or cubic?
-
6Find the mistake. Explain it, then show the correct work.
Spot the Common Mistake
- 1ProblemFind the distance between (2, 1) and (2, 6).
- 2Student thinkingBoth share x = 2, so add the absolute values: |1| + |6| = 1 + 6 = 7.
- 3Student answerThe distance is 7 units.
Which step has the mistake? Explain what went wrong, then show the correct work.
Hint Are 1 and 6 on the same side of zero or opposite sides?
Correct workCorrect answer:
Explain your thinkingHow did you use coordinates and absolute value to find the distance between two points in the same row or column?
Sentence starter The points ___ and ___ share the same ___ -coordinate. To find the distance, I found |___| + |___| = ___, which equals ___ units.
Lesson 7.6Determine Distance on the Coordinate Plane
Version BCore practice
Learning target I can find the distance between two points on the coordinate plane using absolute value.
Why This Matters Captain Vega has two treasure locations on her map: a buried chest at (-3, 2) and a hidden cave at (4, 2). Both are at the same height (y = 2) on the map. She needs to figure out how far apart they are so she knows how much rope to bring. Another pair of treasures is at (1, -3) and (1, 5) — same column, different rows. How far apart is each pair?
-
1Plot and label each point on the grid.
Plot these pairs and find each distance: A(-5, 3) to B(2, 3), and C(4, -2) to D(4, 4)
Show your thinking -
2Complete the table. Show how you found each value.
Find the perimeter of each rectangle using its vertex coordinates.
Rectangle Vertices Width Height Perimeter Rect 1 (-3, 1), (4, 1), (4, 5), (-3, 5) Rect 2 (-2, -4), (6, -4), (6, 2), (-2, 2) Show your work -
3Use the model to solve. Show your work.
What is the total distance from (-6, 3) to (4, 3)?
Show your workAnswer:
-
4Circle the letter of the best answer. Show how you know.
Two points are at (-3, -7) and (-3, 5). What is the distance between them?
- A2 units
- B7 units
- C8 units
- D12 units
Show your work -
5Circle the letter of the best answer. Show how you know.
What is the distance between (2, 3) and (2, 8)?
- A5 units
- B5.5 units
- C6 units
- D11 units
Show your work
-
6Find the mistake. Explain it, then show the correct work.
Spot the Common Mistake
- 1ProblemFind the distance between (-5, 2) and (3, 2).
- 2Student thinkingBoth share y = 2, so subtract the x-values: 5 - 3 = 2.
- 3Student answerThe distance is 2 units.
Which step has the mistake? Explain what went wrong, then show the correct work.
Correct workCorrect answer:
Explain your thinkingHow did you use coordinates and absolute value to find the distance between two points in the same row or column?
Lesson 7.6Determine Distance on the Coordinate Plane
ChallengeExtension
Learning target I can find the distance between two points on the coordinate plane using absolute value.
Why This Matters Captain Vega has two treasure locations on her map: a buried chest at (-3, 2) and a hidden cave at (4, 2). Both are at the same height (y = 2) on the map. She needs to figure out how far apart they are so she knows how much rope to bring. Another pair of treasures is at (1, -3) and (1, 5) — same column, different rows. How far apart is each pair?
-
1Plot and label each point on the grid.
Plot a rectangle with one vertex in each quadrant. Label the vertices and calculate the perimeter.
Show your thinking
-
2Circle the letter of the best answer. Show how you know.
A rectangle has corners (1, 2), (1, 5), (5, 5), and (5, 2). What is its perimeter?
- A7 units
- B10 units
- C12 units
- D14 units
FormulaPut the numbers inWork it outAnswer with its unit -
3Circle the letter of the best answer. Show how you know.
How far apart are the points (-2, 5) and (-2, -3)?
- A-8 units
- B2 units
- C8 units
- D15 units
Show your work
-
4Find the mistake. Explain it, then show the correct work.
Find the Distance Error
- 1ProblemFind the distance between (-3, 4) and (5, 4)
- 2Student thinkingSubtract: 5 - 3 = 2
- 3Student answerThe distance is 2 units
Which step has the mistake? Explain what went wrong, then show the correct work.
Correct workCorrect answer: -
5Answer in complete sentences.
A rectangle has vertices at (-4, -2), (3, -2), (3, 5), and (-4, 5). Find the length, width, perimeter, and area of the rectangle. Show your work using absolute value.
Write your answer