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Grade 7 Geometry — Durable Learning Test
Problem: Area of a Triangle
What is the area of a triangle with a base of 14 cm and a height of 10 cm?
Think: Area = ½ × base × height.
Before choosing an answer, explain how triangle area is calculated.
Choose your answer:
Hint:
Area = ½ × base × height.
Explanation:
½ × 14 × 10 = 70 sq cm.
AI Feedback:
If student chose 70 sq cm: Correct — you applied the formula properly.
If student chose 140 sq cm: Too large — that’s base × height without dividing by 2.
If student chose 35 sq cm: Too small — that’s half of the correct area.
If student chose 28 sq cm: Incorrect — check the multiplication again.
Reflection:
Why do we divide by 2 when finding the area of a triangle?