It is difficult to explain how the formula for calculating the surface area of the sphere was discovered. Anyway, use the formula (4πr2) is really simple.
Steps
Step 1. Calculate the radius
If you know the diameter, divide it by 2 and you will have the radius measurement.
Find the Surface Area of a Sphere Step 1Bullet1
If you know the volume, divide by π, multiply by 3, divide by 4, and take the cube root.
Find the Surface Area of a Sphere Step 1Bullet2
Find the Surface Area of a Sphere Step 2
Step 2. Square it
That is, it multiplies by itself.
Find the Surface Area of a Sphere Step 3
Step 3. Multiply by 4
Find the Surface Area of a Sphere Step 4
Step 4. Multiply by π
If the problem requires the 'exact value' write the symbol π after your number and that's it. Alternatively use 3.14 or the π button on your calculator.
Example
r = 5
52=25
25×4=100
100π or 314, 2
Advice
If the radius includes the square root, such as √5, remember that the coefficient squares and the radical becomes regular. (3√5)2 becomes 9 × 5 which is 45.
Calculating the surface area of a box or container is a very simple process, if you know the measurements of the individual sides. Once you have this information, you simply need to use the correct equation to get the desired result. By carrying out some simple measurements it is even possible to calculate the surface area of a cylindrical box.
One of the most common problems faced in geometry is calculating the area of a circle based on the information provided by the professor or the text of the problem. It is possible to calculate the area of a circle using the classic formula A = πr2 { displaystyle A = \ pi r ^ {2}} .
Calculating the area of a polygon can be simple if it is a figure such as a regular triangle, or very complicated if you are dealing with an irregular shape with eleven sides. If you want to know how to calculate the area of polygons, follow these instructions.
A sphere is a perfectly round three-dimensional geometric body, in which all points on the surface are equidistant from the center. Many commonly used objects, such as balloons or globes are spheres. If you want to calculate the volume you just have to find the radius and insert it in the simple formula:
Using simple words, a sphere is a round solid. To calculate the mass of a sphere it is necessary to have various information available: the dimensions (i.e. the volume occupied) and the density of the material with which it is built or from which it is composed.
