The 6 TRIANGLES I know!
Isosceles, Equilateral, Scalene, Acute, Obtuse, and Right!
An isosceles triangle is tall and skinny the two tall sides are the same and the short one is different. It makes a shape like a party hat.
On an equilateral triangle, all three sides are the same length.
All of the sides on a scalene triangle are different and all the angles are different.
On an acute triangle all the angles in it are less then 90 degrees. It can be the same as an equilateral triangle.
In a obtuse triangle one of the angles is over 90 degrees.
A right triangle is on its side. The angle on its side is a 90 degree angle. It usually has a square where the right angle is.