We have that
if cos(∅)=x----------------> arccos (x)=∅
then
cos(∅)=0.63
∅=arccos(0.63)-------------> ∅=50.95°
<span>
The question does not specify in which quadrant the angle is, </span>since the cosine function is positive, the angle must be in the first quadrant or in the fourth quadrant
<span>if it is in the first quadrant the angle is </span>50.95°
and
if it is in the fourth quadrant the angle is (360°-50.95°)=309.05°
Answer
Bottom
20 *14 =280
Triangular sides
(9 * 12) /2) +(5 *13) /2) *2
Top
20*15
Top
13 *2
Add all together
Answer:
A = pi * r^2 = pi * 5^2 = 25*pi = 78.54 in²