triangle
a pentagon.
Octagon
It make a line of symmentry and something else
what shape is not a triangle but has 3 sides
Any 3D shape with a constant cross-section; in other words, a 2D shape stacked on top of itself, like a triangle on a Toblerone box. But it need not be a triangular shape that is stacked. A rectangular 2-d shape would give a cuboid. Any poygonals shape can be stacked for a prism. Not a piramid, or pyramid even, which is not a prism!
triangle
A trapezoid and a triangle can make a triangle or another trapezoid, among others.
Any shape that is enclosed and has three sides is a triangle.
a pentagon
a pentagon.
Octagon
It make a line of symmentry and something else
it makes shape like a triangle
what shape is not a triangle but has 3 sides
A triangle is a geometric shape.
triangle