Question

Classify the following triangles.

$∆MNO$ with $m\angle M=130°,m\angle S=30°,andm\angle O=20°$.

Answer 1

Here, $m\angle M=130°$.

i.e., one angle of the triangle is greater than $90°$.

Since obtuse angled triangles have at least one angle greater than $90°$.

Hence, $∆MNO$ is an obtuse angled triangle.