Question

Ab is a diameter and ac is a chord of a circle with centre o such that angle bac is equal to 30 degree

Answer 1

Step-by-step explanation:

Construction : Join OC, BC

In ΔAOC

OA = OC

ACO. = OAC = 30

AOC = 120

BOC = 60 ( linear pair)

OCB = 60

BCD = 30

ODC = 30

BCD = BDC = 30

BD = BC

Hence proved