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