Question

The measure of two angles of a triangle are ${110}^0$ and ${65}^0$. Find the measure of the third angle.

• A. $5^0$
• B. ${10}^0$
• C. $4^0$
• D. None of these

Answer 1

The correct option is A $5^0$

By the angle sum property of triangle, sum of all $3$ angles of a triangle is

$180°$.

Let third angle be $x$, then

$110°+65°+x=180°⟹x=180°-110°-65°$

$⟹x=5°$