What are all the diffent kinds of triangle?

Answer 1

right triangle - has one 90° angle

Pythagorean triangle - right triangle whose side lengths are all integers

oblique triangle - has no 90° angle

acute triangle - each angle is less than 90°

obtuse triangle - one angle is greater than 90°

equilateral triangle - angles are 60°-60°-60°

isosceles triangle - has two equal angles

scalene triangle - has three different angles

rational triangle - all side lengths are rational

integer triangle - all side lengths are integers

Heronian triangle - all side lengths and area are integers

equable triangle - has a perimeter of n units and and area of n square units

degenerate triangle - angles are 0°-0°-180°

planar triangle - a triangle drawn on a flat surface (plane)

non-planar triangle - a triangle drawn on a curved surface

spherical triangle - a non-planar triangle on a convex surface, like the Bermuda Triangle

hyperbolic triangle - a non-planar triangle on a concave surface