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.
more ... Coordinates are a set of values that show an exact position. On maps and graphs it is common to have a pair of numbers to show where a point is: the first number shows the distance along and the second number shows the distance up or down. Example: the point (12,5) is 12 units along, and 5 units up.