Question

In a triangle if two angles are ${85}^o$ and ${75}^o$ then the other angle is

• A. ${20}^o$
• B. ${200}^o$
• C. ${80}^o$
• D. ${160}^o$

Answer 1

The correct option is A ${20}^o$

By angle-sum property,

${85}^{\circ }+{75}^{\circ }+$other angle$={180}^{\circ }$

$\therefore$ other angle$={180}^{\circ }-{160}^{\circ }={20}^{\circ }$