# Math Help - Finding radius of circle

1. ## Finding radius of circle

The five lines of a star pentagram is 10 cm. Find the radius of the cricle that will circumscribe the pentagram.

I thought the answer would be 5cm because the diameter had to 10 right? But I checked the answer page and the answer was 5.3cm.

2. The total length of all five lines is 10cm?

3. Originally Posted by Vertazontal
The total length of all five lines is 10cm?
Each line is 10cm.

4. Originally Posted by brownjovi
Each line is 10cm.
I'll see what I can do. I have no trig experience but this doesn't seem too hard.

Edit: If anything, it's one of the few unanswered questions on the entirety of these forums. The older members get to them way too fast!
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