how do u do this question step by step

Answer:
CRT = 18
TRV = 72
V = 18
see attachment
Step-by-step explanation:
CRT = 90 - C = 90 - 72 = 18
TRV = 90 - CRT = 90 - 18 = 72
V = 90 - C = 90 - 72 = 18
RTC =TUS = SXW