`ABCD` is such a quadrilateral that A is the centre of the circle passing through `B, C and D`. Prove that `/_CBD+ /_CDB =1/2 /_BAD`.

ABCD is such a quadrilateral A is the centre of the circle passing through B,C and D. Prove that : angleCBD + angleCDB = 1/2 angleBAD

Draw a circle with the point a of quadrilateral ABCD as centre which passes through the points B,C and D.Prove that angle CBD+ angleCDB=(1)/(2) angle BAD .

Centre of circle passing through A(0,1), B(2,3), C(-2,5) is

Centre of circle passing through A(0,1), B(2,3), C(-2,5) is

ABCD is a quadrilateral, then /_A+/_B+/_C+/_D=

ABCD is a cyclic quadrilateral. A circle passing through A and B meets AD and BC in E and F respectively. Prove that EF||DC

In a quadrilateral ABCD , CO and DO are the bisectors of /_C and /_D respectively. Prove that /_C O D=1/2(/_A+/_B)

Circle with centre (-1,2) and passing through origin is

Circle with centre (-1,2) and passing through origin is