If you want to ask questions about the "following", then I suggest that you make sure that there is something that is following.
Radius = Diameter/2 Diameter = 2* Radius
If the radius is 42 meters, then you already know the radius.
divide diameter by 2
Area of any circle is: pi*radius*radius or pi*r^2
Radius is half of the diameter. So radius2 means rxr.
Radius = Diameter/2 Diameter = 2* Radius
area = radius * radius * Math.pi;
Calculating the radius of a semicircle depends on what information about the semicircle is given.
The equation for calculating the area of a circle is A r2, where A represents the area and r is the radius of the circle.
If the radius is 42 meters, then you already know the radius.
divide diameter by 2
Ï€*r2, where r is the radius of the circle.
Area = pi*[R2 - r2] where R is the outer radius and r the inner radius.
Area of any circle is: pi*radius*radius or pi*r^2
To derive the cross sectional area of a two liter bottle do the following formula. Area = (radius * 2.54 cm/in)^2 * pi = X cm^2.
D = Radius x 2
Its Area = pi * (radius ^2 - height^2)