A three hinged arch shown in the below figur is quarter of a circle, If the vertical and horizontal components of reaction at A are equal, the value of is

A three hinged arch shown in the below figur is quarter of a circle, I

1.	A three hinged arch shown in the below figur is quarter of a circle, If the vertical and horizontal components of reaction at A are equal, the value of is
A.	60
B.	45
C.	30
D.	None in (0 , 90 )
Answer» C. 30