O is the centre of the circle and ABC and EDC are tangents to the circle. E
F
Find the size of angle BCD.
You must give reasons in your answer.
769
BOD = 76 x 2 =152
D
angles in the centre are twice the angles at the
circumference
ABC = 90
CDE = 90
A-
B
BCD = 180 - 152 = 28
С
opposite angles in a cyclic quadrilateral add up to​