Question

answer as soon as possible question C-2

Answer 1

assume origin to be (0,0)
point of passing is (3R/4,R/4)

now you find the distance between origin and the given point

also point right below (3R/4,R/4) intersecting the x-axis is (x,0)

find (x,0)

then find the distance between (3R/4,R/4) and (X,0)

then

Sin(alpha*pi/180) = length of opp side/hypotenuse

Answer 2

Hope you got it.....