Question

two angles of a triangle are of measure 30° and70° respectively. find the third angle.
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Answer 1

Let the third angle be x
Sum of all angles of triangle=180
Here,
30+70+x=180
100+x=180
X=100-180
So
X=80

Answer 2

$\large\mathfrak \pink{Solution:-}$

$\underline \mathbb{GIVEN:-}$

Two angles are given 30° and 70°.

$\underline \mathbb{TO \: FIND:-}$

The third side of the triangle.

$\underline \mathbb{ASSUMPTION:-}$

Let, the 3rd side be x.

$\underline \mathbb{FORMULA:-}$

Sum of all the angles of a triangle is 180°.

$\underline \mathbb{BY \: THE \: PROBLEM:-}$

$30° + 70° + x = 180° \\ \\ \implies \: 100° + x = 180°\\ \\ \implies \:x = 180° - 100°\\ \\ \implies \:x = 80°$

$\underline \mathbb{ANSWER:-}$

The third side of the triangle is 80°