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Math·Geometry and Trigonometry·Right triangles and trigonometry

hard

The measure of angle $R$ is $\frac{5\pi }{6}$ radians. The measure of angle $T$ is $\frac{7\pi }{12}$ radians greater than the measure of angle $R$. What is the measure of angle $T$, in degrees?

A

105

B

150

C

255

D

510