1. ## Regular polygon

Hey Guys,
I need some help finding the value of the variable.
I know you will need to use sine for this one but I don't know what numbers to use.
I know it's a regular polygon with 5 sides so that means each angle is 72.
I don't know what the next step would be.

State the ratio needed, and use it to findthe measure of the indicated line segment to the nearest tenthof a unit.

2. ## Re: Regular polygon

Surely each angle in the polygon is 3 x 180 / 5 = 108 degrees...

3. ## Re: Regular polygon

Originally Posted by Prove It
Surely each angle in the polygon is 3 x 180 / 5 = 108 degrees...
Hi Prove it,
Do you know how to get sine = 5.9 ft for this problem?
I don't seem to know how

4. ## Re: Regular polygon

Sine of WHAT to equal 5.9 ft?

5. ## Re: Regular polygon

Originally Posted by Prove It
Sine of WHAT to equal 5.9 ft?
I don't know, that's what I have to figure out. The answer is sine(?) = 5.9ft

6. ## Re: Regular polygon

Have you started by drawing a triangle using two radii and the side f? Can you fill in any sides and angles?

7. ## Re: Regular polygon

Each triangle is an isosceles triangle with equal sides each equal to 5 ft. equal angles as 54 degree and third angle as 72 degree
The ration will be f/(sin 72 degree ) = 5 / ( sin 54 degree )