In Figure, `A O B` is a straight line. If `/_A O C+/_B O D=85^0,` then `/_C O D=` (a)`85^0` (b) `90^0` (c) `95^0` (d) `100^0`

In Figure, If /_A B C=45^0, then /_A O C= (a) 45^0 (b) 60^0 (c) 75^0 (d) 90^0

In Fig, O A ,\ O B are opposite rays and /_A O C+\ /_B O D=90^0, Find /_C O D .

The diagonals of a parallelogram A B C D intersect at O . If /_B O C=90^0\ a n d\ /_B D C=50^0, then /_O A B= (a) 40^0 (b) 50^0 (c) 10^0 (d) 90^0

In Figure, O is the centre of the circle such that /_A O C\ =130^0,\ then /_A B C= (a) 130^0 (b) 115^0 (c) 65^0 (d) 165^0

The diagonals A C\ a n d\ B D of a rectangle A B C D intersect each other at Pdot If /_A B D=50^0, then /_D P C= 70^0 (b) 90^0 (c) 80^0 (d) 100^0

Line segments A B\ a n d\ C D intersect at O such that A C = D Bdot If /_C A B=45^0a n d\ /_C D B=55^0, then /_B O D= (a) 100^0 (b) 80^0 (c) 90^0 (d) 135^0

Line segments A B a n d C D intersect at O such that A C D Bdot If /_C A B=45^0a n d /_C D B=55^0, then /_B O D= 100^0 (b) 80^0 (c) 90^0 (d) 135^0

If A ,\ B ,\ C are three points on a circle with centre O such that /_A O B=90^0 and /_B O C=120^0, then /_A B C= (a) 60^0 (b) 75^0 (c) 90^0 (d) 135^0

The diagonals of a parallelogram A B C D intersect at O . If /_B O C=90^0\ a n d\ /_B D C=50^0, then /_O A B= 40^0 (b) 50^0 (c) 10^0 (d) 90^0

In Figure, O is the centre of the circle and /_B D C=42^0dot The measure of /_A C B is (a) 42^0 (b) 48^0 (c) 58^0 (d) 52^0