5
Answer: DSet 5: Triangles
Explanation
A triangular running track has one side of 20 miles and another of 15 miles. If one complete lap is 56 miles, what is the length of the third side?
A.
11
B.
10
C.
31
D.✓ Correct
21
Detailed Explanation
Choice D is correct. The perimeter of a triangle is the sum of all three sides. 1. Total perimeter: 56 miles Two known sides: 20 + 15 = 35 miles Third side: 56 - 35 = 21 miles Therefore, the third side is 21 miles.
Key Steps:
•
The correct answer is 21
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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