A circle's center is at (2 ,4 ) and it passes through (3 ,1 ). What is the length of an arc covering (13pi ) /12 radians on the circle?
1 Answer
Feb 18, 2016
arc length = radius x arc angle
radius =
arc angle =
arc length =
Explanation:
First find the radius, r, using the equation of a circle:
The circle's centre is (2,4), so
The circle passes through (3,1), so at this point x=3 and y=1.
Inputting all this into the circle equation:
Therefore: r =
Now we can find the arc length using:
arc length = radius x arc angle
arc angle =
arc length =