The sum of the measures of the interior angles of a convex polygon is 2160°.
how many sides does the polygon have?
a. 12
b. 13
c. 14
d. 15

step-by-step explanation:

what is the figure? attach a picture.

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus