Triangle

A triangle is a polygon with 3 sides.
they have 3 angles that add up to 180 degrees

Equilateral

3 sides are the same length
the 3 angles are all 60 degrees

Isosceles

2 sides are the same length
2 of the angles are the same size

Right Angled

More Details

Scalene

all 3 sides are different lengths
all 3 angles are different sizes