Geometric Proofs:
Geometric Proofs:
Angle Chasing
ERHS Math Club
1. Angles in circles –The measure of an arc is defined as the measure of the central angle that subtends the arc:
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a. The measure of an inscribed angle is one-half the measure of the subtended arc. Prove this in the case above. (Hint: use equal radii and isosceles triangles)
b. Prove that in a cyclic quadrilateral the sum of the measures of opposite angles equals 180°.
c. Let ABCD be a cyclic quadrilateral. Show that ................
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