Points #(2 ,1 )# and #(5 ,9 )# are #(3 pi)/4 # radians apart on a circle. What is the shortest arc length between the points?
1 Answer
Oct 12, 2016
Explanation:
The length of the line segment, c, between the two points points is:
Because the line segment between the two points and two radii form a triangle, we can use the Law of Cosines to find the radius:
The arc length, s, is found using the following: