An angle separates a plane to 3 sets:
1) Points between the 2 rays
2) Points on one of the rays
3) Points outside of the 2 rays
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Since a parallelogram has two sets of parallel sides, a parallelogram containing a 90 degree angle would precisely resemble a square.
It is a parallelogramIf one of the angles is a right angle (then they all are) and the quadrilateral is a rectangle.If both pairs of sides are equal in length (but none of the angles is a right angle) the quadrilateral is a rhombus.If the sides are equal and one of the angles is a right angle, the quadrilateral is a square.
There are 376740 such sets and you must think me crazy if you think I will list them all!
Well, sweetheart, if you wanna know how many sets of 8 are in 864, all you gotta do is divide 864 by 8. And guess what? The answer is 108! So, there you have it, 108 sets of 8 cozying up in that big ol' number 864.
Three sets of four.