Question

the virticle angle of an isosceles triangle is 100 deegre.Find its base angle​

Answer 1

Step-by-step explanation:

Let ΔABC be an isosceles triangle with vertical angle ∠A=100

∘

and AB=AC.

Then,

AB=AC⇒∠B=∠C

But, ∠A+∠B+∠C=180 °

∴100°+2∠B=180 °

⇒∠B=40°