Area of Trapezoids — Notes Packet

My Notes Level 1 Support Level 2 Standard Level 3 Enrichment

Today's objectives

Content Objective: I can find the area of a trapezoid using the formula A = ½(b1 + b2) × h.

Language Objective: I can explain my steps using the words trapezoid, base, height, and area.

📖 See Learn It for the explanation and worked examples, and the Vocab tab for the words. These are your notes to fill in and keep.

✏️ Fill in each blank as we go. Use the Word Bank to help you.

📚 Word Bank — fill each blank with the best word

👆 Tap any word to see what it means and a picture.

Level 3: try the blanks from memory first, then check the bank.

1A quadrilateral with exactly one pair of parallel sides is a .
2One of the two parallel sides of a trapezoid is .
3The other parallel side of a trapezoid is .
4The perpendicular distance between the two parallel bases is the .
5The amount of flat space inside the trapezoid is its .

Write About the Math Guided ESOL writing

Use the support level you need. Every level answers the same math question.

1. Understand the Question

explain

On the grid you copied the trapezoid (bases 8 and 4, height 5), flipped it, and joined it to the original. What shape formed, and how does that explain the 1/2 in the formula?

Your job: Answer the question. Use math evidence. Explain how the evidence proves your answer.Responde la pregunta. Usa evidencia matemática. Explica cómo la evidencia demuestra tu respuesta.

2. Plan Your Math Words

Check at least two words you will use.

Trapezoid — A four-sided shape with just one pair of parallel sides.Trapecio — Una figura de cuatro lados con solo un par de lados paralelos. Base 1 (b1) — One of the two parallel sides of a trapezoid.Base 1 (b1) — Uno de los dos lados paralelos de un trapecio. Base 2 (b2) — The other parallel side of a trapezoid.Base 2 (b2) — El otro lado paralelo de un trapecio. Height — The straight-up distance between the two parallel sides.Altura — La distancia recta entre los dos lados paralelos. Area — How much space is inside a flat shape.Área — Cuánto espacio hay dentro de una figura plana.

Say it first: Say your idea to a partner or quietly to yourself before you write.Di tu idea a un compañero o en voz baja antes de escribir.

When I flip and join the trapezoid, I make a ___.Cuando volteo y uno el trapecio, formo un ___.

3. Build Your Explanation

Model the parts: This model shows the parts of an explanation. It does not answer your writing question.

Claim: We use both bases because the top and bottom are different lengths.

Evidence: Students explain a trapezoid has two parallel sides of different lengths, so using only one would over- or under-count the area; strong answers mention averaging the bases.

Reasoning: This evidence connects the definition of trapezoid to the mathematical claim.

Start

Most language support

Complete the frames. Use the word bank.Completa las oraciones. Usa el banco de palabras.

When I flip and join the trapezoid, I make a ___.Cuando volteo y uno el trapecio, formo un ___.
I added the two bases first because ___.Primero sumé las dos bases porque ___.

Build

Some language support

Write two connected sentences. Use because, so, or but.Escribe dos oraciones conectadas. Usa porque, entonces o pero.

My claim is ___.Mi afirmación es ___.
I know because ___.Lo sé porque ___.
So ___.Entonces ___.

Explain

Light language support

Write a claim, give math evidence, and explain your reasoning.Escribe una afirmación, da evidencia matemática y explica tu razonamiento.

My claim is ___.Mi afirmación es ___.
My math evidence is ___.Mi evidencia matemática es ___.
This proves ___ because ___.Esto demuestra ___ porque ___.

4. Check Your Explanation

I answered the question.Respondí la pregunta. I used math evidence: numbers, an equation, a model, or a comparison.Usé evidencia matemática: números, una ecuación, un modelo o una comparación. I explained how the evidence proves my answer.Expliqué cómo la evidencia demuestra mi respuesta. I used at least two math words.Usé por lo menos dos palabras matemáticas. I reread complete sentences and punctuation.Volví a leer mis oraciones completas y la puntuación.