When used as recommended, CCA-treated wood is harmless to. people, plants, and animals. Its use provides environmental. benefits as well as decades of service. Specify Wolmanized Â® wood and plywood for applications in which conditions conducive to termites and fungal decay are present.
A quadrilateral is a four-sided polygon with four angles. There are many kinds of quadrilaterals. The five most common types are the parallelogram, the rectangle, the square, the trapezoid, and the rhombus. Move your mouse cursor over the figures at the right to learn more.
A 4-sided regular polygon with all sides equal and all internal angles 90Â°. Try this Drag the orange dots on each vertex to reshape the square. The square is probably the best known of the quadrilaterals. It is defined as having all sides equal, and its interior angles all right angles (90Â°). From this it follows that the opposite sides are also parallel. A square is simply a specific case of a regular polygon, in this case with 4 sides. All the facts and properties described for regular polygons apply to a square.