Question

Help me actually,
What is the measure of angle R?

Enter your answer as a decimal in the box. Round only your final answer to the nearest hundredth.

​m∠R=​
°

Answer 1

Answer:

Step-by-step explanation:

Cos(R) = adjacent / hypotenuse

Adjacent is the side connected to the angle

Adjacent = 12

Hypotenuse = 13

Cos(R) = 12 / 13 = .9231

Now you find R by taking the inverse cos of (R). On most calculators it is 2nd function cos

R = cos-1(0.9231)

Answer: R = 22.62 degrees

Answer 2

$\\ \rm\Rrightarrow sinR=\dfrac{Perpendicular}{Hypotenuse}$

$\\ \rm\Rrightarrow sinR=\dfrac{5}{13}$

$\\ \rm\Rrightarrow sinR=0.38$

$\\ \rm\Rrightarrow R=sin^{-1}(0.38)$

$\\ \rm\Rrightarrow R=22.33°$