Question

In a right angled triangle, one angle is ${78}^o.$ Find the other angle.

• A. ${10}^o$
• B. ${12}^o$
• C. $2^o$
• D. ${15}^o$

Answer 1

Answer: (B)

${12}^o$

A right triangle is a triangle with one angle that is exactly ${90}^o.$

And one of the two angles is ${78}^o.$

Let the other angle be $x.$

Sum of the angles ${180}^o.$

${90}^o+{78}^o+x={180}^o$

$x={180}^o-{168}^o$

The other angle $={12}^o.$