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A portion of the area of a circle?
pi X radius squared X the percent of the circle.
If radius of a circle is diminished by 10 percent then it's area is diminished by?
Radius 10, area = 100 pi; radius 9, area = 81 pi
Is 22 over 7 the same as pi?
No. But it's very convenient, and so close to 'pi' that it's often perfectly good enough for the purpose. In fact, it's amazing how close (22/7) really is ... it's larger than 'pi' by only about 0.04 percent !
The radius of a circle has increased by 20 percent By what percentage does the area increase?
((x*1.2)^2*pi-x^2*pi)/(x^2*pi)=0.44where X is the old radius((the new area - the old area) divided with the old area)The area increases with 44%
How do you find the diameter using the cicumference of a cicle?
D=diameter... P=Pi(3.14159265)pi x D==================Divide the circumference by 'pi' to get the diameter.'Pi' is a number that can never be written exactly ... which is why a symbol is used instead. Its value is known to several thousand decimal places, which is more than anybody will ever need for any practical purpose.If you use [22/7] for 'pi', your answer is correct within 0.04 percent, which is pretty good.If you want the answer correct within one part in a million, use [3.14159] for 'pi'.
