A polygon; specifically a tetragon.
A two-dimensional shape with four equal sides and four right angles is a square. A two-dimensional shape with two sets of equal sides and four right angles is a rectangle. A two-dimensional shape with two sets of equal sides and two sets of equal angles is a parallelogram. A parallelogram where each opposite angel bisects the shape is a rhombus.
A two-dimensional shape with one set of equal, parallel sides and two sets of equal angles is a trapezoid.
A three-dimensional shape with four triangular faces is a tetrahedron.
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A seven sided object is called a septagon and the angles add up to 900 degres
A 100-sided polygon is called a hectogon.
it is called an icosagon
it is called a pentagon
It is called a hexagon.