If two angles of a triangle are 21° and 38°, then the

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If two angles of a triangle are 21° and 38°, then the triangle is

1. Right-angled triangle
2. Acute-angled triangle
3. Obtuse-angled triangle
4. Isosceles triangle

Correct Option: C

Given , two angles of a triangle are 21° and 38°
We know that , Sum of three angles of triangle = 180°
Third angle of triangle = 180° – (21° + 38°)
Third angle of triangle = 180° – 59° = 121° > 90°
i.e., It is an obtuse angle .