pentagon
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A picture of a pentagon looks like a house--that is a five sided figure with four vertices. Other objects that you may be familiar with that are pentagons are: a baseball home plate, the Pentagon building in DC, or a soccer ball patch.
Pentagon
Well, sugar, if the radius of a baseball is 1.5 inches and home plate is 16 inches wide, we can calculate the circumference of the baseball (3.14 x diameter) and then divide the width of home plate by that distance to find out how many rotations it would take. So, it would take approximately 3 rotations for that sassy baseball to roll across home plate.
There are three 90 degree angles. (Looking at home plate from a "pitcher's viewpoint), the wide "front" of home plate has 90 degree angles on both sides. The back point, e.g. "the heart of the plate," is also a 90 degree angle. The two angles closest to the batter's back foot are both 135 degrees. This is because these angles are the sum of a 90 degree angle and a 45 degree angle. The back "triangle" of home plate is a 45-45-90 triangle. Hope this helps.
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