What is the length of the side of an equilateral triangle whose altitude has a length of 18in ? A) 12 B) 12 sq root 3 C) 9 sq root 3 D) 6

B) 12 sq root 3

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Why

because the altitude divides the base in half, and tan 60 = 18 / half the base

so, half the base equals 6 square root of 3

then, the whole base equals 12 square root of 3

and all the sides of an equilateral triangle are equal.

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