Best Answer : put two pentagons one on top of the other and rotate them counting the number of times they match ( to find the rotation symmetry ) , draw a circle and mark its center then draw a pentagon whose every corner touches the circle and see if drawing a diameter that goes through the center leaves the same figure on each side of the divided ...
An Ordered Pair. When we write down points on our coordinate plane, we call it an ordered pair because we have two numbers. We need the two numbers to tell us where the point is on the coordinate plane. The first number tells us where it is on the x-axis, and the second number tells us where it is on the y-axis.
A coordinate system is a two-dimensional number line, for example, two perpendicular number lines or axes. This is a typical coordinate system: The horizontal axis is called the x-axis and the vertical axis is called the y-axis. The center of the coordinate system (where the lines intersect) is called the origin. The axes intersect when both x and y are zero. The coordinates of the origin are (0, 0). An ordered pair contains the coordinates of one point in the coordinate system. A point is named by its ordered pair of the form of (x, y).