### Home > CCG > Chapter 7 > Lesson 7.1.4 > Problem7-43

7-43.

Felipe set his hinged mirror so that its angle was $36°$ and the core region was isosceles, as shown below.

1. How many sides did his resulting polygon have? Show how you know.

How many times does $36°$ go into $360°$?

Since $360°\div36°=10$, his regular polygon will have $10$ sides.

2. What is another name for this polygon?

See the Math Notes box in Lesson 7.1.4 on regular polygons.