Respuesta :
Answer:
Sin = PQ / PR = OPPOSITE / HYPOTENUSE
Step-by-step explanation:
Please find the attached file for a clearer understanding.
SOHCAHTOA
Sin = opposite / Hypotenuse
Cos = Adjacent / Hypotenuse
Tan = opposite / Adjacent
Math is fun

Answer:
R, R=27.8°
Step-by-step explanation:
21/45 = PQ/PR
Sin R = 21/45
R = 27.81814928