### Home > GC > Chapter 7 > Lesson 7.1.4 > Problem 7-39

7-39.

Felipe set his hinged mirror so that its angle was 36° and the core region was isosceles, as shown at right. Homework Help ✎ How many sides did his resulting polygon have? Show how you know.

What is another name for this polygon?

How many times does 36° go into 360°?

Since 360° ÷ 36° = 10, his regular polygon will have 10 sides.

See the Math Notes box in Lesson 7.1.4.