Chapter 2 - Section 2.5 - Convex Polygons - Exercises - Page 114: 11

A) 360 degrees B) 360 degrees

A) We know that each angle in an equilateral triangle is 90 degrees, so the exterior angles are 120 degrees. Since there are 3 angles, it follows that the sum of all of the exterior angles is (120)(3)=360 degrees. B) The exterior angles of the rectangle are right angles, so they are each 90 degrees. Since there are 4 of them, the sum is: (90)(4)=360 degrees.