Asked by Anonymous

What is the vertex angle of an isosceles triangle with sides that measure of 22, 22, and 28 millimeters.

Answers

Answered by Steve
Draw a diagram, showing the altitude.
Consider the sine of 1/2 the vertex angle. Its opposite side is half the base, and its hypotenuse is the slanting side. So,

sin(θ/2) = 14/22
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