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 shape that does not have equal sides is a scalene triangle. In a scalene triangle, all three sides are of different lengths, and consequently, the angles are also unequal. This differentiates it from equilateral and isosceles triangles, which have at least two equal sides.
A scalene triangle
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'.