Question

plese solve it ,it's important

Answer 1

angle abc = angle acb=40° (angle opp to equal sides of an isoceles angles are always equal)
b+c+a=180°
80+a=180
a=°

ob=oc=4.5cm ( given )

Answer 2

Hi, solution is here :-

a) To find - ∠BAO

∠ABC = ∠ACB ( angles opp. to equal sides are equal )

So, ∠ABC = ∠ACB = 40 °

∠A + ∠B + ∠C = 180 °
80 ° + ∠A = 180 °
So, ∠A = 100

So, ∠BAO + ∠COA = 100 °
2 ∠BAO = 100 ° ( ∠BAO = ∠COA )
∠BAO = 100 °/2
= 50 °


b) To Find - Measure of OC

OB = OC ( Triangle AOB is symmetrical to Triangle AOC )

So, OB = OC = 4.5 cm


Hope This Helps You