1956 AHSME Problems/Problem 10
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:
is an equilateral triangle, so ∠
must be
°. Since
is on the circle and ∠
contains arc
, we know that ∠
is
°
.