So all other quadrilaterals are irregular. The only regular (all sides equal and all angles equal) quadrilateral is a square. and that's it for the special quadrilaterals. one of the diagonals bisects (cuts equally in half) the other.the diagonals, shown as dashed lines above, meet at.The KiteĮach pair is made of two equal-length sides that join up. (the US and UK definitions are swapped over!)Īn Isosceles trapezoid, as shown above, has left and right sides of equal length that join to the base at equal angles. NOTE: Squares, Rectangles and Rhombuses are allĪ trapezoid (called a trapezium in the UK) has a pair of opposite sides parallel.Īnd a trapezium (called a trapezoid in the UK) is a quadrilateral with NO parallel sides: Also opposite anglesĪre equal (angles "A" are the same, and angles "B" Shapes with parallel sides The parallelogram is a special type of quadrilateral. One other shape has parallel sides: the parallelogram. The ParallelogramĪ parallelogram has opposite sides parallel and equal in length. Parallel shapes We know that many types of quadrilaterals, such as the trapezoids, a rhombus, rectangles, and all the regular polygons (except for the triangle), have parallel sides. In other words they "bisect" (cut in half) each other at right angles.Ī rhombus is sometimes called a rhomb or a diamond. In maths, this usually comes in the form of learning about. The RhombusĪ rhombus is a four-sided shape where all sides have equal length (marked "s").Īlso opposite sides are parallel and opposite angles are equal.Īnother interesting thing is that the diagonals (dashed lines) meet in the middle at a right angle. Parallel refers to two objects or lines that stay the same distance apart for their entire length. The SquareĪ square has equal sides (marked "s") and every angle is a right angle (90°)Ī square also fits the definition of a rectangle (all angles are 90°), and a rhombus (all sides are equal length). The little squares in each corner mean "right angle"Ī rectangle is a four-sided shape where every angle is a right angle (90°).Īlso opposite sides are parallel and of equal length. Let us look at each type in turn: The Rectangle Some types are also included in the definition of other types! For example a square, rhombus and rectangle are also parallelograms. There are special types of quadrilateral: They should add to 360° Types of Quadrilaterals Try drawing a quadrilateral, and measure the angles. interior angles that add to 360 degrees:.Total surface area (TSA) 2 (lb + bh + lh) Volume (V) l × b × h. A typical rectangular parallelepiped is a shoebox. All of the parallel edges have the same length. (Also see this on Interactive Quadrilaterals) Properties A unique parallelepiped, with all six faces being rectangular in shape, is the rectangular parallelepiped, which is also known as a cuboid.
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