2
Answer: ASet 1: Triangles
Explanation
Jack's triangular garden has two sides of 6 centimeters and 25 centimeters. The total border length is 51 centimeters. How long is the remaining side?
A.✓ Correct
20
B.
30
C.
40
D.
10
Detailed Explanation
Choice A is correct. The perimeter of a triangle is the sum of all three sides. 1. Total perimeter: 51 centimeters Two known sides: 6 + 25 = 31 centimeters Third side: 51 - 31 = 20 centimeters Therefore, the third side is 20 centimeters.
Key Steps:
•
The correct answer is 20
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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