### Home > GC > Chapter 12 > Lesson 12.2.2 > Problem 12-65

12-65.

For each situation below, decide if is greater,

*is greater, if they are the same value, or if not enough information is given.*

is the measure of a central angle of an equilateral triangle;is the measure of an interior angle of a regular pentagon.The central angle of the triangle is

divided by , which is .

Is there enough information given?

What do you need to know?

Third side is approximately

units, so is opposite the greater side and must be greater than.

What does this equation tell you?

Find the lengths of the unknown sides.