Question

Calculate ZQRP 12 cm Р R 18 cm

Answer 1

Answer:

<QRP = 48.2°

Step-by-step explanation:

Given:

PR = 18 cm

QR = 12 cm

Required:

<QRP = angle R

Solution:

Reference angle = <R (<QRP)

Adjacent side length = 12 cm

Hypotenuse = 18 cm

Thus:

Cos (R) = 12/18

cos (R) = 0.6667

$R = Cos^{-1}(0.6667)$

$R = 48.1871227$

<QRP = 48.2° (nearest tenth)