Angles:
Acute->measures of angles all less than 90 degrees.
Obtuse->One angle greater than 90 degrees.
Right->One angle exactly 90 degrees.
Equilateral->all equal sides
Isosceles-> 2 equal sides
Scalene->No equal sides
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They are: equilateral, isosceles, obtuse, scalene and right angle triangles
right triangle. obtuse triangle. acute triangle
One way of classifying triangles is by the number of congruent sides (angles). A triangle is equilateral if all its sides are equal. All its angles will also be equal. A triangle is isosceles if two of its sides are equal. The angles at the end of the third side will be equal to one another. A triangle is scalene if all three sides are of different length. In this case, all three angles will also be different.
All right angle triangles have a 90 degree angle and two acute angles and the 3 of them together add up to 180 degrees
All triangles are 3-sided. There are 3 different kinds. One where all 3 sides are equal length and have equal angles is called an Equilateral triangle. A triangle with two sides and angles the same is known as an Isosceles triangle. The last kind of triangle has 3 unequal sides and 3 unequal angles and it is called a Scalene triangle.