Geometry help:-(

@hennars (250)
United Arab Emirates
February 12, 2007 12:02am CST
This is about Area of circle and circumference prob that I'm not so good at them.Please advice. We know formula of circle area = pi x r x r (answer must be given square units at the end) while circle circumference is C=pi x 2 x r But I'm doubtful how to work out of these below prob( use pi = 3.14) Also how to make out which formula to work out;-P 1)Given circle with circumference of 31.4m, find its area? 2)Given circle with area of 314m(sq.units ie 2), find its circumference. Many thanks in advance
1 response
@twinkle76 (104)
• Philippines
12 Feb 07
for question 1 : substitute circum value 31.4m to circumference formula, thus u get the value of r.. then substitute the value of r in the formula of area..that's how simple.. i think you havn't paid much attention to your teacher, this is simple algebra.. you do the same principle to question number 2. hope i helped you..