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The rectangle has four of them, and any parallelogram that has one of them is a rectangle.
Yes, a rectangle has 4 right angles : one in each corner.
Hmm. Just place a ruler so one edge is at one corner and then swing the ruler around to the opposite corner and read the distance. Is that what you meant? Answer 2 Why don't you just put a ruler from corner to corner? Is that a problem?
A triangle Square An equilateral triangle on a sphere that distends 90 degrees (think of a triangle with one corner at the north pole, one corner on the equator at the 0 meridian, and one corner on the equator at 90 degrees longitude. Each corner of this spherical triangle measures 90 degrees.
Because it has 4 sides