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Mathematics 13 Online
OpenStudy (anonymous):

Which is the exact area of a circle with radius fourteen centimeters?

OpenStudy (dehelloo):

https://www.youtube.com/watch?v=SjHxXel0hZI

OpenStudy (aaronandyson):

Area of a circle = pi*radius*radius

OpenStudy (aaronandyson):

therefore, 14*14*22/7

OpenStudy (anonymous):

FORMULA : A = pi*r^2 A = pi * (14)^2 A = 196 * pi cm^2 That is the exact answer containing pi. The decimal approximation would replace pi with 3.14 and multiply by 196.

OpenStudy (aaronandyson):

7 times 2 is 14

OpenStudy (anonymous):

fourteen centimeters squared fourteen times pi centimeters squared twenty-eight times pi centimeters squared one hundred ninety-six times pi centimeters squared

OpenStudy (aaronandyson):

14*!4 = 196 196*22/7 = area of a circle

OpenStudy (aaronandyson):

196/7 = 28

OpenStudy (aaronandyson):

28*22 = ?

OpenStudy (anonymous):

616

OpenStudy (aaronandyson):

correct!

OpenStudy (aaronandyson):

It's D

OpenStudy (aaronandyson):

one hundred ninety-six times pi centimeters squared

OpenStudy (aaronandyson):

in term of math, 196*pi

OpenStudy (aaronandyson):

pi = 22/7 = 3.14

OpenStudy (aaronandyson):

196*3.14 = 615.44

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