91Ó°ÊÓ

For each statement, select always (A), sometimes (S), or never (N). a. An angle inscribed in a semicircle is a right angle. b. An angle inscribed in a major arc is obtuse. c. An arc measure equals the measure of its central angle. d. The measure of an angle formed by two intersecting chords equals the measure of its intercepted arc. e. The measure of the angle formed by two tangents to a circle equals the supplement of the central angle of the minor intercepted arc.

A circle with diameter \(9.6 \mathrm{cm}\) has two parallel chords with lengths \(5.2 \mathrm{cm}\) and \(8.2 \mathrm{cm}\) How far apart are the chords? Find two possible answers.

Prove that the acute angles in a right triangle are complementary. Explain why this is a corollary of the Triangle Sum Theorem.