Answer: Assuming the riders starts at the position (20, 0) on the x-axis, the exact position of the rider will be (20cos75, 20sin75) or about (5.18, 19.32).
The angle for 5pi/12 radians is 75 degrees. Therefore, to find the position we can use the sine and cosine of 75 to find the x and y value of the coordinate.
For the y-value, we can write and solve:
sin75 = x/20
For the x-value, we can write and solve:
cos75 = x/20
Hello!
Just multiply across:
4/5 * 20.5/1 = 4(20.5) / 5(1) = 82 / 5 = 16.4
So 4/5 of 20.5 is 16.4.
Hope this helps :))