1 Answer

Nauphal · Answer 1 · 2022-09-02T03:12:20+0000

Answer:

∠ R ≈ 39°

Explanation:

Using the cosine ratio in the right triangle

cos R =
(adjacent)/(hypotenuse) =
(RS)/(QR) =
(61)/(78) , then

∠ R =
cos^(-1) (
(61)/(78) ) ≈ 39° ( to the nearest degree )

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