A rectangle has two lines of symmetry. It can be folded horizontally and vertically, from the middle of the sides, but it cannot be folded corner to corner to achieve a line of symmetry. More »

In geometry, a line of symmetry is a line that divides a shape into two halves that match exactly, as if reflected in a mirror. Line symmetry is sometimes called reflective symmetry because each point on one side of the ... More »

A regular decagon has 10 lines of symmetry, one line drawn through each vertex and one line drawn through the midpoint of each edge. A line of symmetry indicates where a polygon can be folded in half to form two equal sh... More »

To find the intersection point of two lines, you must know both lines' equations. Once those are known, solve both equations for "x," then substitute the answer for "x" in either line's equation and solve for "y." The po... More »

An isosceles triangle could have rotational symmetry if it were also an equilateral triangle. An isosceles triangle is a triangle with at least two equal sides. An equilateral triangle is a triangle with exactly three eq... More »

Skew lines are lines that do not exist in the same plane; therefore, they can never intersect. Skew lines do not define planes, and skew lines are not parallel. More »

A triangle can have two perpendicular sides. If two sides are perpendicular, the angle they form is a right angle. A triangle can have only one right angle. More »