`A B\ a n d\ C D` are diameters of a circle with centre `Odot` If `/_O B D=50^0,` find `/_A O C`

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

In Fig. 10.36, A,B and C are three points on a circle with centre O such that /_B O C""=" "30^o and /_A O B" "=" "60^o . If D is a point on the circle other than the arc ABC, find /_A D Cdot

In Fig. 10.36, A,B and C are three points on a circle with centre O such that \ /_B O C=\ 30^o and \ /_A O B =\ 60^o . If D is a point on the circle other than the arc ABC, find /_A D Cdot

If A B ,\ B C\ a n d\ C D are equal chords of a circle with O as centre and A D diameter, then /_A O B= (a) 60^0 (b) 90^0 (c) 120^0 (d) none of these

If A B , B C a n d C D are equal chords of a circle with O as centre and A D diameter, then /_A O B= 60^0 (b) 90^0 (c) 120^0 (d) none of these

In Figure, A B\ a n d\ A C are two equal chords of a circle whose centre is O . If O D\ _|_A B\ a n d\ O E\ _|_A C , prove that /_\A D E is an isosceles triangle.

Two lines A B\ a n d\ C D intersect at Odot If /_A O C+/_C O B+/_B O D=270^0 , find the measures of /_A O C ,\ /_C O B ,\ /_B O D and /_D O A .

Two lines A B\ a n d\ C D intersect at Odot If /_A O C+/_C O B+/_B O D=270^0 , find the measures of /_A O C ,\ /_C O B ,\ /_B O D and /_D O A .

Two straight lines A B\ a n d\ C D intersect one another at the point Odot If /_A O C+/_C O B+/_B O D=274^0, then /_A O D=

In the given figure A B is the diameter of the circle, centred at Odot If /_C O A=60^0,A B=2r ,A C=d , and CD=l