In Figure, calculate the measure of `/_A O Cdot`

In Figure,calculate the measure of /_AOC .

A B C D is a square. A C\ a n d\ B D intersect at O . State the measure of /_A O B .

In the adjoining figure the perimeter of DeltaPQA is 20cm then calculate the measure of (AB+AC) ?

If sec2A=cosec(A-27) , when 2A is an acute angle, then the measure of /_A is

In a cyclic square ABCD, twice the measure of /_A is thrice the measure of /_C . Find the measure of /_C .

In Figure, lines A B ,\ C D\ a n d\ E F intersect at O . Find the measures of /_A O C ,\ /_C O F ,\ /_D O E\ a n d\ /_B O F .

In Figure, O is the centre of the circle. If /_A P B=50^0, find /_A O B\ a n d\ /_O A B

In fig.36, two of the angles are indicated. What are the measures of /_A C X\ a n d\ /_A C B ?