PSAT Math Multiple-Choice Practice Question 709
Question: 709
Six identical isosceles triangles are arranged as shown in the figure below. If one side of each triangle has length a and if the other two sides each have length b, what is the outside perimeter of the figure above in terms of a and b?
Correct Answer: B
Explanation:
(B) Notice that the top and bottom sides each have a length of 3a, while the left and right sides will each have a length of b. Therefore, P = 3a + b + 3a + b. Combine like terms:
P = 6a + 2b
The answer is choice (B).
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