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What is a four sided object called?
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.
What quadrilateral has 1 set of parallel sides and 2 right angles?
a pollygon
What shape has one set of parallel lines but no right angles?
A general trapezium, and selected versions of polygons with 5 or more sides.
Does an arrowhead have opposite angles equal?
It has one pair of opposite angles that are equal but not two.
Are all rhombus similar?
No. In order to be similar, their angles must be equal. Rhombuses don't all have to have the same set of angles. All a rhombus needs is four equal sides. Different rhombuses can be "squished" by different amounts.
