Answer:
8.91
Step-by-step explanation:
Since the triangle is a right triangle, we can use trig functions
sin 63 = opp side/ hyp
sin 63 = h/10
10 sin 63 = h
8.910065242=h
h = 8.91
Apply the cosine double angle identity to get:
Cos 2PI/3
Answer:i do not know
d