What is the measure of angle A if it intercepts two arcs, one with a measure of 87 degrees and the other with a measure of 33 degrees?
You don't have to guess if you know this:
"When a tangent and a secant, two secants, or two tangents intersect outside a circle then the measure of the angle formed is one-half the positive difference of the measures of the intercepted arcs."
The measure of an exterior angle is equal to half the difference of the measure of intercepted arcs
= 1/2 ( 87-33) = ......... o