Question

Two angles of a triangle are ${60}^o$ and ${40}^o$. Find its third angle.

• A. ${80}^o$
• B. ${85}^o$
• C. ${70}^o$
• D. ${60}^o$

Answer 1

The correct option is A

${80}^o$

Given that - Two angles of a triangle are ${60}^o$ and ${40}^o$.

Sum of angles of a triangle = ${180}^o$

Therefore third angle = ${180}^o-({60}^o+{40}^o)$

= ${80}^o$