Question

answer this question plz

Answer 1

its very easy
BO and CO are bisector.
ABC is a issosles triangle
therefore the base angle will also be equal. (it's a property)
and thus the angleOBC=angle OCB
as base angles are equal therefore BOC is isosceles.

Answer 2

hope this help you.
$24.0 \times \frac{?}{?}$