Bunuel wrote:

The figure above consists of an isosceles triangle and 7 semicircles, each having the same diameter. If the perimeter of the triangle is 28, what is the radius of one of the semicircles?

(A) 1

(B) 2

(C) 4

(D) 6

(E) 7

Attachment:

2017-11-29_0807_001.png

We see that the perimeter of the triangle is equivalent to 7 diameters; thus, each diameter must be equal to 4, so the radius of any one of the circles is 2.

Answer: B

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