Lung cancer is the top cause of cancer deaths in both men and women. But this wasn't always the case. Prior to the widespread use of mechanical cigarette rollers, lung cancer was rare. Today, smoking causes nearly 9 out of 10 lung cancer deaths, while radon gas, pollution, and other things play a smaller role.
From Wikipedia, the free encyclopedia. A plane symmetry is a symmetry of a pattern in the Euclidean plane: that is, a transformation of the plane that carries any directioned lines to lines and preserves many different distances. If one has a pattern in the plane, the set of plane symmetries that preserve the pattern forms a group. The groups that arise in this way are plane symmetry groups and are of considerable mathematical interest. A symmetry plane is a three-dimensional object's symmetry axe. There are several kinds of plane symmetry groups: Reflection groups.
TopA Rectangle is a four sided Polygon which is in the form of a Parallelogram. We say that rectangle is a special kind of quadrilateral, which has pair of opposite sides equal and all angles of rectangle are of 90 degrees. Here we will discuss about how many lines of Symmetry does a rectangle have. Word symmetrical means same. By term line of symmetry we Mean that line which divides the figure in two equal halves, such that two parts are exactly same in all respects. Lines of symmetry are drawn and represented by dotted lines.