Unit 5 · Standard 6.GR.1
Determine the Area of Triangles
Sky Harbor Mission
The Triangular Skylight
You are the lead architect at Sky Harbor Studio. The city has hired your firm to design a glass skylight made of triangular panels for the new transit hub. Before the glass can be cut, you must master the area of triangles — every wrong measurement wastes expensive glass.
My Notes Level 1 Support Level 2 Standard Level 3 Enrichment
Today's objectives
Content Objective: I can find the area of a triangle using the formula A = ½ × base × height.
Language Objective: I can explain my steps using the words base, height, area, and perpendicular.
📖 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.
👆 Tap any word to see its meaning and a picture.
Level 3: try the blanks from memory first, then check the bank.
- 1The side of a triangle you measure the height from at a 90° angle is the .
- 2The perpendicular distance from the base to the opposite vertex is the .
- 3The amount of flat space inside a triangle is its .
- 4Two lines that meet at a 90° angle are .
- 5A shape made of two or more basic shapes combined is a .
- 6A math rule written with symbols, like A = ½ × b × h, is a .
- 7Two sides that stay the same distance apart and never meet are .
Write About the Math
How many cans of paint does the homeowner need?¿Cuántas latas de pintura necesita el dueño de la casa?
Say your answer to a partner first. Then write it, using at least two of these words:
Model: The height is the perpendicular distance from the base to the top corner. — Students identify the height as the perpendicular (straight-up, 90-degree) distance from the base to the opposite vertex, not the slanted side.
Start
Complete the frames. Use the word bank.Completa las oraciones. Usa el banco de palabras.
- The wall's area is ___ sq ft because A = 1/2 × ___ × ___. She needs ___ cans because ___ ÷ 50 = ___.
- My answer is ___ because ___.Mi respuesta es ___ porque ___.
Build
Write two connected sentences. Use because, so, or but.Escribe dos oraciones conectadas. Usa porque, entonces o pero.
- My claim is ___.Mi afirmación es ___.
- My evidence is ___, so ___.Mi evidencia es ___, entonces ___.
Explain
Write a claim, give math evidence, and explain your reasoning.Escribe una afirmación, da evidencia matemática y explica tu razonamiento.