Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. What is a quadrilateral? A quadrilateral is a four-sided shape where each of the sides are straight and ...

Read by Robert Blythe from the BBC Radio Drama Company. Once upon a time, a long time ago, there lived a perfect shape: Mr Square. He was the squarest of them all; he lived in a perfectly square house ...

Click to open image viewer. Hinged Plane Dissection, Two quadrilaterals and two pentagons which can be arranged as a hexagon or a quadrilateral. CC0 Usage Conditions ApplyClick for more information.

A quadrilateral is a four-sided shape. It could be a square, rectangle, kite, rhombus, parallelogram or trapezium. For any quadrilateral, the angles of the four corners add up to \(360^\circ\). The ...