Question

∆GHI is an isosceles triangle with a vertex angle H
If the m∠H=80°, then find the m∠I.

Answer 1

the answer is actually 75 degrees

Explanation:

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Answer 2

Given :

∆GHI is an isosceles triangle with a vertex angle H.

m∠H=80°

To Find :

The m∠I.

Solution :

Since, H is the vertex angle.

So, m∠I = m∠G = x

We know, by angle sum property of triangle :

m∠I + m∠G + m∠H = 180°

2x + 80° = 180°

x = 50°

Therefore, m∠I = 50° .