If it is just the radius, it is half of the diameter. If you are given the circumference, divide the given measure value by 3.14. Then, divide the result by 2 to get the radius! Have fun! If you need any help with other math formula's just post another answer. I'll write full, complete, and correct answers that I'm sure about.
David (venom751998)
The formula for calculating the circumference of a circle is 2pr where r=radius and p (pie) = 3.1416 so for your question thr circumference = 2 x 3.1416 x 8 = 50.2656
Calculating the radius of a semicircle depends on what information about the semicircle is given.
The area of a sphere is 4 (pi) (radius)2. The area of 1/2 of the sphere is 2 (pi) (radius)2. If you want to add in the flat end of the hemisphere, that makes the total surface area 3 (pi) (radius)2.
Assuming the shape is a regular dodecagon, the formula for calculating the perimeter for a dodecagon of side length n is equal to 12n.
What do you mean 'finding'? Pi is the ratip of the circumference to the radius of a circle.
divide diameter by 2
The formula for calculating the surface area of a sphere is 4πr², where r is the radius of the sphere. This formula represents the area covered by the curved surface of the sphere.
Its Area = pi * (radius ^2 - height^2)
Area = pi*[R2 - r2] where R is the outer radius and r the inner radius.
V=4/3*Pi*r3 where r is the radius.
Area of any circle = (pi) x (Radius)2
That is the formula for calculating the area of a circle with a 10 unit radius. The answer is 314 sq units.
[2 x pie x radius] or [pie x diameter]
4/3*pi*r3 where the radius of the tank is measured in decimetres.
2,,r or ,,d 2x pi x radius or Pi x Diameter
You can use the cosine rule to calculate the central angle.
The formula for calculating the area of a circle - is Pi x r x r... where r is the radius.