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A triangle is a shape with three sides and three angles. This is a very basic shape taught to young children.
The following shape has three sides and the only angles are right angles. ----- | |___
A shape that has 10 sides (two dimensional) is called a decagon. A shape that has 10 faces (three dimensional) is call a decahedron.
An equilateral triangle has three equal sides and three equal angles.
A decagon. A two-dimensional shape (plane figure, or polygon) which has ten sides is a decagon. A three-dimensional shape (polyhedron) which has ten sides (plane faces) is a decahedron.