What is the sum of the measures of the interior angles of a regular polygon if each exterior angle measures 90 degrees
a 1,080 degrees
b 900 degrees
c 540 degrees
d 180 degrees
e 360 degrees

Item 1 use the polygon tool to draw a rectangle with a length of 4 units and a height of 2 units. one of the sides of the rectangle falls on line ef , and the rectangle has a vertex of e. each segment on the grid represents 1 unit.