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.
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Cut them into triangles and use the pythagorean theorem
isolies
They are: equilateral, isosceles, obtuse, scalene and right angle triangles
4 What are the 4 kinds? I count 2 kinds: the base is a square, and the other 4 faces are all triangles.
right triangle. obtuse triangle. acute triangle