Classify the following triangles as acute-angled, obtuse-angled, right-angled triangles according to the magnitude of their angles.
(ii) $30 °, 60 °, 90 °$

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Solution

An acute angle triangle is a type of triangle in which all the three internal angles of the triangle is less than $90 °$
Obtuse angle triangle is a type of triangle in which any one of the angle is more than $90 °$
A right angle triangle is a type of triangle that has one angle that measures $90 °$
So here we have one of the angle of a triangle = $90 °$
Hence, this is a right angle triangle.

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