Question

The measures of two angles of a triangle are ${35}^o$ and ${45}^o$. What is the measure of the third angle of the triangle?

• A. ${95}^o$
• B. ${100}^o$
• C. ${105}^o$
• D. ${110}^o$

Answer 1

Answer: (B)

${100}^o$

The sum of three angles of a triangle is ${180}^o$.
Let the third angle be $\theta$
We have $\theta +45+35=180$

$\theta =180-(45+35)$

$\Rightarrow \theta =100$