Question

Identify type of triangle

(a) Obtuse- angled triangle

Answer 1

A obtuse-angled triangle is a triangle in which measure of one of the angle is greater than $90°$and less than $180°.$

In$△ABC$

$$\begin{gathered} \angle A<90° \\ \angle B>90° \\ \angle C<90° \end{gathered}$$

As, one of the angle is $>90°$ therefore the triangle is an obtuse-angled triangle.

$\therefore △ABC$ is an obtuse-angled triangle.