Michael J. answered 03/30/15
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
The perimeter of a rectangle is
Perimeter = 2(length) + 2(width)
Substitute the given values of length and width to get your perimeter.
The perimeter of a semicircle is half of the circumference of a full circle.
Circumference = (2 * 3.14 * radius) / 2
= 3.14 * radius
Substitute the given value of the radius to get your perimeter.