they have 3 sides and 3 corners,more then one type of triangles,there are different types of triangles,they are shades,they can be equal to 180,they can have 3 congruent sides,they can be congruent,they can be classified by their length,shapes, have sided they have 3 corners,there are they types of triangles,they can have 2 congruent sides.,triangles are polygons with 3 sides,they come in different sizes,triangles have three equal sides,a triangle is a polygon,they have 3 sides and the corners,they have three equal sides,shapes,have sided,they can have different angles/sizes,they have 3 sides and they are shapes,scalene,why are they so important?,isosceles,more then one tap of triangles,equilateral,they have 3 sides,its 3 sided. all sides add to 180 degree,