Answer:
S) 230°
T) 45°
Explanation:
S) m∠RST = 30°. An inscribed angle is half the central angle, so RT = 60°.
SR = 70°, so ST = SR + RT = 60° + 70° = 130°.
SPT = 360° − ST = 360° − 130° = 230°
T) m∠DCA = 60°. An inscribed angle is half the central angle, so AD = 120°.
DB = AD − BA = 120° − 75° = 45°