What is the measure of DEF

107 degrees

Step-by-step explanation:

The external angle (135 degrees) and the 2 farthest angles away from it (added together) are congruent to one another. The 2 farthest angles would be Angle D and Angle E. In this case we need to find Angle E.

All you need to do is subtract 28 from 135 (the external angle):

135 - 28 = 107

So, Angle DEF = 107 degrees.

the multiples of 15 are 15, 30,45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195,   210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375,   390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, and 735.

the factors of 15 are 1, 3, 5, and 15.

hope that , fam!

-une, your fren : )