Question

In following figure . O is the centre of the circle. Find ∠ BAC.

Answer 1

BOC is the diameter of circle,

∴ ∠ BOC = 180°

Since are BC makes ∠ BOC  at the centre and ∠ BAC on the remaining part of the circle.

∴ ∠ BAC = `1/2` ∠ BOC

∴ ∠ BAC = `1/2 xx 180 = 90 ^circ`