7

Set 5: Triangles

Explanation

Answer: D

Evelyn is making a triangular sail with a base of 13 centimeters and a height of 5 centimeters. What is the area of the sail?

A.

22.5

B.

42.5

C.

16

D.

32.5

✓ Correct

Detailed Explanation

Choice D is correct. Area of a triangle: A=12×base×heightA = \frac{1}{2} \times base \times height 1. A=12×13×5A = \frac{1}{2} \times 13 \times 5 A=12×65A = \frac{1}{2} \times 65 A=32.5A = 32.5 Therefore, the area is 32.5 square centimeters.

Key Steps:

•

The correct answer is 32.5

Why others are wrong:
A: This would give an incorrect result. Choice A is incorrect and may result from a calculation error.
B: This would give an incorrect result. Choice B is incorrect and may result from a calculation error.
C: This would give an incorrect result. Choice C is incorrect and may result from a calculation error.
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