Question

Find the remaining angle of triangle whose two angles are 50${}^o$ and ${60}^o$ .

• A. 70${}^o$
• B. 55${}^o$
• C. 75${}^o$
• D. none

Answer 1

Answer: (A)

70${}^o$

Let the $3^{rd}$ angle be $x$.

Given, angles $={50}^0,{60}^0$

We know that the sum of three angles is ${180}^0$

So,

${50}^0+{60}^0+x={180}^0$

${110}^0+x={180}^0$

$x={180}^0-{110}^0$

$x={70}^0$

Hence, this is the answer.