It means that the total length of the sides or boundary of the 2-dimensional shape is 30 feet.
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It is 5 feet because 2*(10+5) = 30 feet which is the perimeter
Well, if you're talking about a square, then the perimeter is twice the length plus twice the width; in this case it would be 30 feet...
60ft
It is: 30*30 = 900 square inches
10 feet because 10+5+10+5 = 30 feet