## Theorems

## Theorem 1: If an angle is inscribed in a circle, then its measure is half the measure of its intercepted arc.

m< B = 1/2

## Theorem 2: IF AND ONLY IF QS is a diameter of the circle.

< R = 90

## Theorem 3: A quadrilateral can be inscribed in a circle IF AND ONLY IF its opposite angles are supplementary.

m< D + m <F = 180

m<C + m<E = 180

## Math Instructor |