Question

find a,b,c with solution

Answer 1

a will be 40 as the angle subtented by a diameter on the surface of the circle is 90
 be will be 40     as total angle of the triangle is 180
c will be 50      as total angle of the triangle is 180

Answer 2

a=> 90-50= 40degrees

b=> 180-(90+50)= 40degrees

c=> 180-(90+40)= 50degrees

Hope it helped! Good luck!

P. S. a = 40 because the angle on one side of a circle is 90degrees so 90-50=40degrees