Either one is fine. It's your choice.
It'll be a lot easier if you use the same units that the sides are given in.
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The unit of measurement used to find perimeters can vary depending on the context and preference. In general, inches would be used in the imperial system of measurement, while centimeters would be used in the metric system of measurement.
9 times 13 = 117 square inches
62.5
Use: 2*pi*radius = circumference
You use a ruler or similar object that is marked with centimeters. If your ruler only has inches, measure the inches, then multiply with 2.54 to get centimeters.
To find the perimeters of a triangle you add the three sides together. if you get one of the two congruent sides you know the other congruent side. Then you use the pathagrium theorem to find the last side and add them up. Pathagrium theorem= a square + b square = c square where c is the hypotenuse