3
Answer: BSet 4: Triangles
Explanation
Charlotte designs triangular earrings. Each earring has two equal sides of 10 kilometers and a base of 8 kilometers. What is the perimeter of one earring?
A.
38
B.✓ Correct
28
C.
18
D.
14
Detailed Explanation
Choice B is correct. An isosceles triangle has two equal sides. 1. Two equal sides: 2 × 10 = 20 kilometers Base: 8 kilometers Perimeter: 20 + 8 = 28 kilometers Therefore, the perimeter is 28 kilometers.
Key Steps:
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The correct answer is 28
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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