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AB=AC, it means angles opposite to equal sides are equal.therefere

angle B is also equal to angle C.

let the missing angles be x

⇒x°+x°+40°= 180°

⇒2x°+40°=180°

⇒2x°=180-40

⇒2x°=140°

⇒x°=140°/2

=70°

angle ABC = 70°

i think this will help u.

angle B is also equal to angle C.

let the missing angles be x

⇒x°+x°+40°= 180°

⇒2x°+40°=180°

⇒2x°=180-40

⇒2x°=140°

⇒x°=140°/2

=70°

angle ABC = 70°

i think this will help u.

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.

Sum of three angles A + B + C = 180°

so sum of angles ABC + ACB = 180 ° - 40° = 140°

Since two sides are equal, it is an isosceles triangle.

so angle ACB = angle ABC = 140 /2 = 70°

so sum of angles ABC + ACB = 180 ° - 40° = 140°

Since two sides are equal, it is an isosceles triangle.

so angle ACB = angle ABC = 140 /2 = 70°