10
Answer: ASet 1: Triangles
Explanation
Ava's triangular garden has two sides of 12 centimeters and 5 centimeters. The total border length is 28 centimeters. How long is the remaining side?
A.✓ Correct
11
B.
21
C.
1
D.
5
Detailed Explanation
Choice A is correct. The perimeter of a triangle is the sum of all three sides. 1. Total perimeter: 28 centimeters Two known sides: 12 + 5 = 17 centimeters Third side: 28 - 17 = 11 centimeters Therefore, the third side is 11 centimeters.
Key Steps:
•
The correct answer is 11
Why others are wrong:
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.
D: This would give an incorrect result. Choice D is incorrect and may result from a calculation error.
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