Question

Sum of two angles of a triangle is 120 °. Find the measure of third angle.​

Answer 1

Answer:

60° is the answer

Given

sum of the two angles of traingle is 120°.

total sum of the interior angles in a traingle is 180°.

hence,let the third angle be say 'x'.

120 + x =180°

x = 180 - 120

x = 60°

therefore,the third angle is 60°.

Answer 2

Answer:

The measure of the third angle is 60°.

Step-by-step explanation:

Given: Sum of two angles of a triangle is 120 °.

To find the measure of third angle.​

We know, angle sum property of triangle which states that sum of all angles in a triangle is 180°.

Let angles be $\alpha ,\beta ,\gamma$.

So, $\alpha +\beta +\gamma=180$

Let $\alpha +\beta =120$

Then, $120+\gamma=180$

$\gamma=60$

Therefore, the measure of the third angle is 60°.

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