Category: 11. Construction and drawing in geometry

An orthographic drawing is a drawing that shows the top view, front view, and right-side view of a three-dimensional figure. We can also simply call the right-side view side view. Here is how to make an orthographic drawing of the three-dimensional figure below.  Before you do the drawing, you need to clearly label or identify…

An isometric drawing uses isometric dot paper in order to draw objects. It may not be easy to draw objects that have length, width, and height such as a box on a piece of paper. Isometric dot paper In order to draw or make objects that are three-dimensional on a piece of paper, you will…

The order of rotational symmetry of a geometric figure is the number of times you can rotate the geometric figure so that it looks exactly the same as the original figure.  You only need to rotate the figure up to 360 degrees. Once you have rotated the figure 360 degrees, you are back to the…

A figure has line symmetry if it can be folded along a line so that one half of the figure is a mirror image of its other half. You can also say that the figure has reflectional symmetry. The reflection line is called the line of symmetry. A figure can have no line of symmetry,…

We can use a straightedge and compass to construct geometric figures, such as angles, triangles, regular n-gon, and others. In this case, measuring instruments such as a ruler and a protractor are not permitted.  A ruler can be used if and only if its markings are not used. Below, find a variety of important constructions…