If a perimeter of 8 is obtained by adding 5 and unknown number, then the unknown number is 3.2.
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38 + a number = 59 so the unknown number = 59 - 38 = 21
22n + 2.
A triangle with sides of 2.4, 2.4 and 3.4, will have a perimeter of 8.1. Remember to include the unit of measure in your answer.
Perimeter equals 2 Length plus 2 width so find what l a w is then multiply them
74 units.