,if the swimmer is in a 100m race she swims the first half of the race and 32.34 seconds and the last half of the race and 34.83
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If a pentagon is regular, then all of the sides are the same length. This means that
So, if , the lengths of the sides evaluate to
So, all the sides of the pentagon are 21 units long, and AB is 21 units long as well, because all sides are the same length.