The measure of each interior angle of a regular polygon is 150 degrees

true or false: the polygon has 12 sides.

True

Step-by-step explanation:

The sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

here n = 12

sum = 180° × 10 = 1800°, hence

interior angle = = 150° → True

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk