Question

If in any triangle, two angles are ${30}^0$ and ${70}^0$, find the third angle.

Answer 1

Consider a triangle of which two angles are ${30}^0$ and ${70}^0$.

Let, $3^{rd}$ angle of triangle is $x$

Now, we know that sum of triangle is =${180}^0$

So,

$x+{30}^0+{70}^0={180}^0$

$x={180}^0-{100}^0$

$x={80}^0$

Hence, this is the answer.