A composite figure is just simpler shapes stuck together. You find each piece's area and add them up. So the feeder skills are rectangle and triangle area plus adding areas. Warm those up and any L-shape or house-shape becomes a few easy pieces.
Answer these 3, then press Show my path. No grade — this just points you to the right level.
1. A rectangle is 4 by 3. What is its area?
2. What is 15 + 9?
3. A triangle has base 4 and height 3. Its area is base × height ÷ 2 = ?
A composite figure is made of simple shapes (rectangles and triangles) joined together. The trick: break it into pieces, find each piece's area, then add the areas together.
Your quick check picks one for you, but you can switch any time:
Level 0 Find each piece, then add.
A. Rectangle one is 3 by 4. Area = 3 × 4 = ___?
3 × 4 = 12 square units.
B. Rectangle two is 2 by 4. Area = 2 × 4 = ___?
2 × 4 = 8 square units.
C. Add the two pieces: 12 + 8 = ___?
12 + 8 = 20 square units.
Level 1 Add a rectangle and a triangle.
A. A rectangle is 5 by 4. Area = ___?
5 × 4 = 20 square units.
B. A triangle has base 4 and height 3. Area = base × height ÷ 2 = ___?
4 × 3 = 12, half of 12 = 6 square units.
C. Add both pieces: 20 + 6 = ___?
20 + 6 = 26 square units.
Level 2 Stretch: three pieces added together.
A. Rectangle 6 by 5, plus rectangle 2 by 5. Find both, then add: ___?
6 × 5 = 30 and 2 × 5 = 10; 30 + 10 = 40 square units.
B. A figure has a rectangle of area 24 and a triangle of area 9. Total area = ___?
24 + 9 = 33 square units.
1. Two pieces have areas 18 and 7. What is the total area?
18 + 7 = 25 square units.
2. A rectangle of area 30 and a triangle of area 5 are joined. Total area = ___?
30 + 5 = 35 square units.
You've practiced exactly what Lesson 5-5 uses. Time to dive in.
Start Lesson 5-5 →