I have the direct length between the start and end of a chord, and I have the included angle. How can I find the radius of the circle the arc is on?
Thanks
Hello, therealdrag0!
Did you follow skeeter's suggestion?I have the length of a chord, and I have the included angle.
How can I find the radius of the circle?
Code:* * * A * * * / | * * r / | * / | * / | * * O * θ |d * * \ | * \ | * r \ | * * \ | * * * * * * B
You know: .
Law of Cosines: .
. .
Hence, we have: .
There! . . . We just invented a formula for this problem . . .