Question

Classify following triangle into acute, obtuse, right triangle:
In $△ABC,\angle A={90}^o,\angle B={60}^o,\angle C={30}^o$.

Answer 1

Since the triangle have one angle of $90°(\angle A=90°)$ and two angles are acute angles, i.e., less than $90°\left(\angle B\text{and}\angle C\right)$, hence the given triangle is right angled triangle.