Question

How to classify a triangle by side and angle ?

Answer 1

By angle:

We can classify a triangle 4 different ways when we're judging it by it's angle(s).

Acute: A triangle where all angles are less than 90 degrees.

Obtuse: A triangle where one angle is greater than 90 degrees.

Right: A triangle where one of the angles is exactly 90 degrees.

Equiangular: A triangle where all angles are the same (60 degrees.)

We can also classify a triangle by its sides:

Equilateral: (technically the same as an equiangular triangle, in order to have 3 equal sides you must have 3 equal angles as well.)

Isosceles: Two sides are the same length, where one is not.

Scalene: All three sides are different lengths.

I hope this helps!