Cos x = 15÷17
because cos is adjacent side over hypotenuse.
Answer:A i think
Step-by-step explanation:the lines
Answer:
13-gon
Step-by-step explanation:
The sum of the interior angles of a polygon with n sides is:
S = 180° (n − 2)
If S = 1980°, then:
1980° = 180° (n − 2)
11 = n − 2
n = 13
