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 polygon can have four sides and four angles, or many sides and many angles. A three-sided polygon is called a triangle, from the Greek word tri meaning three as in tricycle, or tripod. A three-sided polygon is called a triangle, from the Greek word tri meaning three as in tricycle, or tripod. It is very easy to find examples of triangles in the world around us, as in this street sign: A geometric drawing of a triangle is seen below. Every polygon is formed of points and segments joining the points. Each point is called a vertex (the plural for vertex is vertices), and the segments are called the sides of the polygon. The triangle below is called triangle ABC using the triangle symbol in the name, as shown. The triangle is the simplest polygon, and one of the most useful geometric figures. The triangle is also the strongest geometric figure, and is therefore used in the construction of buildings and bridges. Take a drinking straw, and cut it into three pieces.