A n-gonal pyramid will have n triangles and one polygon with n sides (n>=3). The simplest of these is the tetrahedron (a triangular pyramid).
octogon
what shape is not a triangle but has 3 sides
It could be a right angle triangle
A scalene triangle
Any shape, other than a triangle can have a pair of perpendicular sides.
octogon
A triangle perhaps which has only 3 sides
a traingle can not have no sides, then it wouldnlt be a triangle, as far as i know, all 2d dimensional shapes have at least 3 SIDES, a shape with no sides isn't a shape, its nothing ness A scalene triangle- All sides are different
you seroiusly dont know? its a triangle (3 sides)
An isosceles triangle is a shape that has at least 2 sides that are the same length. This forces the angles to be acute.
what shape is not a triangle but has 3 sides
It could be a right angle triangle
There is no shape that is made up 3 sides that is not a triangle. Any shape that is made up of 3 sides is classified as a triangle no matter what shape or size it is.
A three sided closed plane figure (shape) is a triangle.
A scalene triangle
Any shape, other than a triangle can have a pair of perpendicular sides.
A TRIGON , more usually a 'Triangle'.