Question

The measure of an angle which is vertically opposite to an angle 80⁰ is _______​

Answer 1

80 only..

.... Vertical opposite angles are equal

Answer 2

Angles a° and c° are also vertically opposite angles, so must be equal, which means they are 140° each. Answer: a = 140°, b = 40° and c = 140°. Note: They are also called Vertical Angles, which is just another way of saying the same thing.