3
Answer: BSet 4: Triangles
Explanation
Emma wants to build a triangular fence for a farm. Two sides measure 20 kilometers and 5 kilometers. If Emma has exactly 41 kilometers of fencing material, what must be the length of the third side?
A.
6
B.✓ Correct
16
C.
26
D.
8
Detailed Explanation
Choice B is correct. The perimeter of a triangle is the sum of all three sides. 1. Total perimeter: 41 kilometers Two known sides: 20 + 5 = 25 kilometers Third side: 41 - 25 = 16 kilometers Therefore, the third side is 16 kilometers.
Key Steps:
•
The correct answer is 16
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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