Topic: Area of Circle Using Circumference
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Answers to Common Questions
How to Calculate the Area & Circumference of a Circle
The circumference and area of a circle are related to its radius or diameter. If you know the circle's radius or diameter, you can calculate both circumference and area using the universal constant pi (a letter in the Greek alphabet), which... Read More »
Source: http://www.ehow.com/how_7274267_calculate-area-circumference-circ...
How do you find the exact circumference of a circle using the are...
Most people know the following two equations for a circle: c = 2πr a = πr 2 What you can do then, is rearrange the latter of the two, solving for r, and then plug it into the first one where r currently is: a = πr 2 r 2 = a/π r = (a/π) 1/2 ... Read More »
Source: http://wiki.answers.com/Q/How_do_you_find_the_exact_circumference...
Why do we use Pi to find the circumference and area of a circle?
the reason is because a circle is divided in 3 parts and the left overs are .14 so when you measure the ciecumference, you times the diameter by 3.14 and you get the correct answer to the question.EX: R=3.5cm D=7cm 7cm so that is why we use... Read More »
Source: http://wiki.answers.com/Q/Why_do_we_use_Pi_to_find_the_circumfere...
More Common Questions
Answers to Other Common Questions
From the circumference y, you can find the diameter by dividing by pi. Knowing the diameter, you can calculate the area by either dividing the diameter by 2, squaring it and multiplying by pi, or by squaring the diameter, dividing by 4 and ...
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Source: http://wiki.answers.com/Q/How_do_you_find_the_area_of_a_circle_by...
I'm not quite sure what you are allowed to use here. If a diameter is given, then circumference = pi x diameter, or equivalently 2 x pi x radius. And the area is pi x r^2, where r is the radius But something tells me that's not what you mea...
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Source: http://wiki.answers.com/Q/How_do_you_find_the_circumference_and_a...
If you know the circumferece, divide by 2pi to get the radius. Knowing the radius, you can use the formula Area = pi x r squared.
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Source: http://www.chacha.com/question/what-is-the-formula-for-area-of-a-...
In every circle . . . Area = (pi) x (radius) 2 Diameter = 2 x radius Circumference = (pi) x diameter In this circle, Area = (pi) R 2 = 81 R 2 = 81 / pi R = sqrt( 81 / pi ) Diameter = 2 x sqrt( 81 / pi ) Circumference = (pi) x 2 x sqrt( 81 /...
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Source: http://wiki.answers.com/Q/What_is_the_circumference_of_a_circle_w...
Actually, Eratosthenes of Cyrene (276? - 195? B.C.) was the first to calculate the Earth's circumference accurately. He is supposed to be the inventor. Note: There are comments associated with this question. See the discussion page to add t...
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Source: http://wiki.answers.com/Q/Who_invented_area_and_circumference_of_...
25.78310078 or about 26 square units
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Source: http://wiki.answers.com/Q/What_is_the_area_of_a_circle_with_circu...
The area of circle with a circumference of 20 is: 31.83 units squared.
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Source: http://wiki.answers.com/Q/What_is_the_area_of_circle_with_a_circu...
