Perimeter, Circumference, and Area 1.7 This presentation was created following the Fair Use Guidelines for Educational Multimedia. Certain materials are included under the Fair Use exemption of the U. S. Copyright Law. Further use of these materials and this presentation is restricted.

Perimeter, Circumference, and Area Formulas square – side length = s –perimeter = 4s –area = s 2 Triangle – side lengths = a, b, and c, height = h –Perimeter = a + b + c –Area = ½bh Rectangle – length = l, width = w –Perimeter = 2l + 2w –Area = lw Circle – radius = r –Circumference = 2  r or  d –Area =  r 2 s h a b c l w r

A Problem-Solving Plan Define the problem. Ask yourself what you need to solve the problem. Label unknown and known facts. Choose related definitions, theorems, and formulas. Reason logically. Write a conclusion. Check that your reasoning is correct.