Question

how many obtuse angles does this triangle have? image of a green right - angled triangle
options:
○ 0
○ 2
○ 1
○ 3

Explanation:

Step1: Recall obtuse angle definition

An obtuse angle is $> 90^\circ$ and $< 180^\circ$.

Step2: Analyze the triangle

The triangle is a right triangle (has a $90^\circ$ angle). The sum of triangle angles is $180^\circ$. So the other two angles sum to $180 - 90 = 90^\circ$, meaning they are acute ($< 90^\circ$). Thus, no obtuse angles.

Answer:

0