A circle has a center at (1 ,2 )(1,2) and passes through (4 ,3 )(4,3). What is the length of an arc covering pi /4 π4 radians on the circle?

1 Answer
Jan 28, 2016

( sqrt(10) pi ) / 4 10π4

Explanation:

Please check my solution here for a detailed explanation.

Solution
Radius r = sqrt( (4 - 1)^2 + (3 - 2)^2 ) = sqrt(10) r=(41)2+(32)2=10.
Arc length S = ( sqrt(10) pi ) / 4 S=10π4.