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What is the perimeter of a circle with the radius of 7cm and diameter of 14cm?
The perimeter of a circle is equal to pi times the diameter, so for a circle with a diameter of 14 cm, multiply by pi, which is approximately 3.14, and you get 43.96 cm, which for most purposes you could round off to 44 cm.
How do you find the circumfence of a circle?
The circumference is Pi x diameter. Pi is a constant that is often rounded off to 3.14.
What is the formula for area of the circle?
The formula for area of a circle is TTr2.This means that we multiply 3.14(the rounded off nunber for pi) by the radius and radius(3.14xradiusxradius).If the diameter is given,divide it by 2 to get the radius.
One cent is equal to how many square feet?
You need to measure the diameter of the cent. Then divide the diameter in half to get the radius. The formula for area of a circle = ?r2, where ? is 3.14159. I think you would be better off using millimeters or centimeters instead of ft.
What is the circumference of a circle?
The circumference is the distance around the circle, its "perimeter."The circumference of a circle is equal to π times the diameter of the circle (C = πd), or π times twice the radius of the circle (C = 2πr).The circumference is the distance around itIf you know the diameter (width) of the circle, you can use the formulaCircumference= Diameter x pi (approx 3.1416)Example : if a circle has a diameter of 5 cm then the circumference is 5 x π =5π (about 15.7 cm)The actual formula relates to the radius of the circle, which is half the diameter.Radius Formula : C = 2πr (2 pi times the radius)As long you remember the formula you should be fine....Circumference = 2 * pi * rOr pi * dwhere r = radius & d = diameter of the circle.Also pi (=3.143) can be roughly put down as 22/7 if you more comfy with fractions than the decimals.the equation is 2*pi*rr being the radius
