8-1 Day 3

More with interior and exterior angles of polygons

Let’s look at yesterday’s assignment

What is the measure of each exterior angle of a regular pentagon?

1. What is the measure of each exterior angle of a regular decagon?

2. What is the measure of each exterior angle of a regular octagon?

3. What is the measure of each exterior angle of a regular heptagon?

4. What is the measure of each exterior angle of a regular 18-gon?

So… if the exterior angles always have a sum of 360 degrees try to answer these

questions.

If each exterior angle of a regular polygon has a measure of 45 degrees. How many sides does the polygon have?

• If each exterior angle of a regular polygon has a measure of 15 degrees. How many sides does the polygon have?

• If each exterior angle of a regular polygon has a measure of 20 degrees. How many sides does the polygon have?

• If each exterior angle of a regular polygon has a measure of 36 degrees. How many sides does the polygon have?

If an interior angle of a regular polygon has a measure of 157.5 degrees, how many sides does

the polygon have?

• If an interior angle of a regular polygon has a measure of 135 degrees, how many sides does the polygon have?

• If an interior angle of a regular polygon has a measure of 60 degrees, how many sides does the polygon have?

• If an interior angle of a regular polygon has a measure of 144 degrees, how many sides does the polygon have?

*** remember that one interior plus one exterior = 180

Rally Robin

Check your Rally Robin

Assignment

Finish Worksheet page 91 and 92