A three-hinged circular arch ACB is formed by two quadrants of circles AC and BC of radii 2R and R respectively with C as crown, as shown in the figure at side. Consider the following in respect of the reactive forces developed at support A and B due to concentrated load W at the Crown. 1. Line of action at A is inclined as 45° to the horizontal. 2. = = /2 3. = 2 4. = = /2 Which of the above is/are correct ?

A three-hinged circular arch ACB is formed by two quadrants of circles

1.	A three-hinged circular arch ACB is formed by two quadrants of circles AC and BC of radii 2R and R respectively with C as crown, as shown in the figure at side. Consider the following in respect of the reactive forces developed at support A and B due to concentrated load W at the Crown. 1. Line of action at A is inclined as 45° to the horizontal. 2. = = /2 3. = 2 4. = = /2 Which of the above is/are correct ?
A.	1 and 3
B.	2 and 3
C.	1, 2 and 4
D.	4 only
Answer» B. 2 and 3

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