9
Answer: BSet 4: Triangles
Explanation
Sebastian designs triangular earrings. Each earring has two equal sides of 18 miles and a base of 3 miles. What is the perimeter of one earring?
A.
29
B.✓ Correct
39
C.
49
D.
19
Detailed Explanation
Choice B is correct. An isosceles triangle has two equal sides. 1. Two equal sides: 2 × 18 = 36 miles Base: 3 miles Perimeter: 36 + 3 = 39 miles Therefore, the perimeter is 39 miles.
Key Steps:
•
The correct answer is 39
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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