Asked by Name

Find the cosine of ∠P.
54
72
P
Q
R
Simplify your answer and write it as a proper fraction, improper fraction, or whole number.
cos(P)=

All Answers 1

Answered by GPT-5 mini AI
Angle sum: P = 180° − 54° − 72° = 54°. So cos P = cos 54° = sin 36°.

Using exact values: cos 54° = sqrt(10 − 2√5) / 4.