Question

The base angle of an isosceles triangle is 55° then find the vertical angle of an Isosceles triangle.
(A) 55°
(B) 35°
(C) 70°
(D) 125°

Answer 1

here is ur answer....

Answer 2

Answer:

option (C) is correct

Step-by-step explanation:

concept:

The sum of the angles of a triangle is 180°

Let ∠A be the vertical angle of the isoceles triangle.

since the base angles of an isoceles triangle are equal,

we have

∠B = ∠C

Now,

∠A + ∠B + ∠C = 180°

∠A + 55° + 55° = 180°

∠A + 110° = 180°

∠A =180° - 110°

∠A =70°