Lesson 5.35.3 Small Group · Group 1
Group 1 · Set BSecond form · new problems, same idea
Learning target With my small group, I can find the area of a trapezoid using the formula A = ½(b1 + b2) × h — one step at a time, with support.
Remember5.3 Small Group · Group 1
The area of a trapezoid is half of the sum of the two bases times the height, because two trapezoids make a parallelogram. To find the area of a trapezoid, add the two bases, multiply by the height, then take half.
Words: Trapezoid (Trapecio)Parallel (Paralelas)Base 1 (b1) (Base 1 (b1))Base 2 (b2) (Base 2 (b2))Height (Altura)
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1Complete each step, then write the final answer.
A trapezoid has bases of 6 m and 10 m. Its height is 3 m. Find its area.
Show your workHint Add the bases: 6 + 10 = 16. Multiply by 3. Then take half.
Final answer: -
2Complete each step, then write the final answer.
A trapezoid has bases of 4 m and 10 m. Its height is 6 m. Find its area.
Show your workHint Add the bases. Multiply by the height. Then take half.
Final answer: -
3Complete each step, then write the final answer.
A road sign is a trapezoid. Its parallel sides are 20 inches and 30 inches. Its height is 16 inches. What is the area of the sign?
Show your workHint The parallel sides are the bases. Add them first.
Final answer: -
4Complete each step, then write the final answer.
A trapezoid has bases of 5 ft and 8 ft. Its height is 3 ft. Find its area.
Show your workHint Follow the same steps. Half of an odd number ends in .5.
Final answer:
Explain your thinkingWhy do we add both bases before we multiply? Use Rosa’s mistake to explain.
Sentence starter A trapezoid has ___ bases, so we ___. · Rosa got 42 because she ___.