5. The external angle of a cyclic quadrilateral is equal to the internal opposite
angle.
6. The degree measure of an intercepted arc is half the measure of the inscribed
angle.
7. If a right angle is inscribed in a circle, the endpoints of the angle are the
endpoints of a diameter and the diameter is the hypotenuse.
8. The angles are similar if two inscribed angles intercept the same arc.
9. The measure of the intercepted arc is half of the measure of angle that
intercepts the arc.
10. The degree measure of a semicircle is 180°​