8
Answer: CSet 5: Triangles
Explanation
A triangular picture frame has sides measuring 10 centimeters and 5 centimeters. If the total perimeter is 21 centimeters, find the length of the third side.
A.
3
B.
16
C.✓ Correct
6
D.
12
Detailed Explanation
Choice C is correct. The perimeter of a triangle is the sum of all three sides. 1. Total perimeter: 21 centimeters Two known sides: 10 + 5 = 15 centimeters Third side: 21 - 15 = 6 centimeters Therefore, the third side is 6 centimeters.
Key Steps:
•
The correct answer is 6
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.
D: This would give an incorrect result. Choice D is incorrect and may result from a calculation error.
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