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.
The word polygon is a combination of two Greek words: poly means many and gon means angle. Along with its angles, a polygon also has sides and vertices. Tri means three, so the simplest polygon is called the triangle, because it has three angles.It also has three sides and three vertices.A triangle is always coplanar, which is not true of many of the other polygons.ri means three, so the simplest polygon is called the triangle, because it has three angles. It also has three sides and three vertices. A triangle is always coplanar, which is not true of many of the other polygons.