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Verified Answer :

All you have to do is add up the side lengths we already know then subtract by the perimeter.
60.3 is the side lengths all together that we know
82-60.3=21.7
Hope this helped!!

mpanderla95

To solve for what one of the sides is, basically add all of the sides of this irregular shape and make it equal to the total perimeter.

d + 15.4 + 16.2 + 28.7 = 82

d + 60.3 = 82
d = 82 - 60.3
d = 21.7 cm.

The solution for d is that it is 21.7 cm.