1956 AHSME Problems/Problem 10
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Problem
A circle of radius inches has its center at the vertex
of an equilateral triangle
and
passes through the other two vertices. The side
extended through
intersects the circle
at
. The number of degrees of angle
is:
(A) 15 (B) 30 (C) 60 (D) 90 (E) 120
is an equilateral triangle, so ∠
must be
°. Since
is on the circle and ∠
contains arc
, we know that ∠
is
°
.