It might help if the question indicated whether 5 cm referred to diameter or circumference or something else. Until then, the question cannot be answered and is simply a waste of
http://wiki.answers.com/Q/What_is_the_radius_of_a_...

78.5 cm2. To calculate the area, we can start with the formula for the area
http://www.chacha.com/question/whatistheareaof...

the formula for area of a circle is. area = pi times radius times radius. and pi is a number on your calculator.
http://answers.yahoo.com/question/index?qid=201211...
