In the figure, if angle a = 45 degree and angle d = 60 degree, then find angle c.

In a parallelogram ABCD, if angle A =(2x-20 degree), angle B =(y+15 degree , angle C=(x+40degree), then find the value of x and y .

If triangle ABC is right angled at A and AB = AC then find the value of angle B and angle C.