A triangle.
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A shape that has 10 sides (two dimensional) is called a decagon. A shape that has 10 faces (three dimensional) is call a decahedron.
A shape with 7 sides is a heptagon
A shape with three and only three sides is a triangle, but it is not possible for a triangle to have three perpendicular sides.
A shape with three sides is called a triangle.
A triangle is a shape with three sides and three angles. This is a very basic shape taught to young children.