5. Given a regular decagon and a regular dodecagon, which one has a greater exterior angle? By how much is the angle greater?

Step-by-step explanation:

A regular dodecagon has equal interior angle measures. Since 1800°/12 = 150°, each interior angle in a regular dodecagon has a measure of 150°. Also, each exterior angle has a measure of 30° since the exterior angle and interior angle form a straight angle.

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.