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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).

Q: What is a solid shape with at least three sides shaped like a triangle?

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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.

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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 triangle has three sides, so a hexagon (a shape with six sides) would have three more sides than a triangle.