Question

6. A B C D is a cylic Quadrilateral whose diagonals
AC & BD intersect at the untre of the ole
passing
through the vertices A, B, C &0. What is the particular
shape of the quadrilateral?
Don't post irrelevant answers​

Answer 1

For chord CD,

∠CBD=∠CAD ...Angles in same segment

∠CAD=70°

∠BAD=∠BAC+∠CAD=30°+70°=100°

∠BCD+∠BAD=180° ...Opposite angles of a cyclic quadrilateral

⇒∠BCD+100°=180°

⇒∠BCD=80°

In △ABC

AB=BC (given)

∠BCA=∠CAB ...Angles opposite to equal sides of a triangle

∠BCA=30°

Also, ∠BCD=80°

∠BCA+∠ACD=80°

⇒30°+∠ACD=80°

∠ACD=50°

∠ECD=50°

Answer 2

this is your answer I hope this answer is right