Question

pls solve ques. no. 12 for me

Answer 1

Hope its help u....

Answer 2

Answer :

Given That : ∠ABC = ∠ACB + ∠BAC ....(1)

Sum of all three angles in a triangle = 180°

So,

∠ABC + ∠ACB + ∠BAC = 180°

From (1)

∠ABC + ∠ABC = 180°

2 × ∠ABC = 180°

∠ABC = 180°/20

∠ABC = 90°

So, Your answer if Option (B) 90°