9

Set 1: Triangles

Explanation

Answer: B

A triangular section of a lawn has a base of 10 yards and a perpendicular height of 6 yards. What is the area of this section?

A.

20

B.

30

✓ Correct
C.

15

D.

40

Detailed Explanation

Choice B is correct. Area of a triangle: A=12×base×heightA = \frac{1}{2} \times base \times height 1. A=12×10×6A = \frac{1}{2} \times 10 \times 6 A=12×60A = \frac{1}{2} \times 60 A=30A = 30 Therefore, the area is 30 square yards.

Key Steps:

•

The correct answer is 30

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