The radius of any circle is its diameter divided in half.
So: 18mm/2 = a radius of 9mm
The square of the diameter of a circle is equal to four times the square of the radius of the circle. This relationship arises from the formula for the diameter of a circle, which is two times the radius, and squaring both sides of this equation.
Yes it is. Circumference is the whole area of the circle. Radius is from the middle to the side of the circle. Yes it is. The radius it half way across the circle from the center, while the circumference is all the way around the circle. The diameter is all the way across the circle, while being twice the radius. The circumference is about 3.14 times the diameter (or Pi if you prefer).
Four - Diameter is the length of the circle, one end to the other through the cirle, while radiusis from the middle of the circle , out. Hence Being half. s :)
The diameter of a circle is the length of any line segment drawn through the center of the circle and having endpoints on the line that defines the circumference of the circle. It can also be defined as twice the radius of the circle, with a radius being a line segment with an endpoint at the center of the circle and one on the circumference of the circle.Diameter is a length measurement
Well, honey, the diameter is just double the length of the radius, so if the radius is 2.6, then the diameter would be 5.2. It's as simple as that, no need to overcomplicate things. Hope that clears things up for you, sweetie!
When the diameter of a circle is halved, the radius is also halved since the radius is half of the diameter. The area of a circle is calculated using the formula A = πr^2, where r is the radius. If the radius is halved, the area is reduced to one-fourth of its original size because the radius is squared in the formula. Therefore, halving the diameter of a circle results in the area being reduced to one-fourth of its original area.
the area of a circle is pi times the radius squared, the radius being half the diameter. Pi is approximately 3.14
The answer will depend on whether the 6 feet refers to the radius or diameter of the circle and which length is being measured in lineal feet.
201 square inches. Area is calculated as the value pi times the square of the circle's radius; pi being approximately 3.1416 and the radius being half the diameter. So in this case, area A = pi X 8 X 8 = 3.1416 X 64 = 201 square inches (approx.)
area of a circle = pi*r^2 with pi being 3.1415926535..... that is the ratio between the diameter of the circle and it's circumference. r stands for radius (half the diameter if you didn't know) so for this circle to find the area all you have to do is 12 (half of 24 the diameter to find the radius) , then square it (144) then times it by pi which equals approximately 452.39 meters^2
The formula for the area of a circle is pi(r2)...ie: 3.14xr2 The circumference is pi(diameter) and the radius (r) is half of the diameter (d) Example...if the circumference is 25.12in then the area is 50.24in Work being... Circumference = 3.14(d)=25.12 To find the diameter you have to get d by itself... Divide 3.14 to both sides to do that 3.14/3.14(d)=25.12/3.14 d=8 Now that you have the diameter you know that the radius is half of the diameter so radius (r)=4 Therefore the area of the circle is 3.14(42)=50.24in
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