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Known Parameter:

Round Of

Table of Content
 1 Hemisphere Formulas: 2 How to do the Hemisphere Calculations Manually: 3 What is a hemisphere? 4 What is the TSA of the sphere? 5 How do you find the diameter of a hemisphere? 6 Why is it called Hemisphere?
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An online hemisphere calculator helps you to find the different properties of hemisphere from any 1 known variables. Also, this online tool calculates the variables in terms of Pi (ᴨ). The calculator allows you to determine the variables from the following known variable.

• Total surface area.
• Volume.
• Curved surface area.
• Base circumference.

By using this online calculator, you will be able to calculate the volume of a hemisphere as well as the surface area of a hemisphere with the circumference of the base.

## Hemisphere Formulas:

As it is the sphere divided into two halves, so its calculations is the same as the calculations for the sphere just divided by two.

• The formula used by this online volume of a hemisphere calculator is as follows:

$$V = \frac{2}{3}\pi r^3$$

• The formula for the circumference of base is:

$$C = 2 \pi r$$

• The formula for curved surface area is:

$$A = 2 \pi r^2$$

• The formula for the calculation of the base area of a hemisphere:

$$B = \pi r^2$$

• Total surface area of the hemisphere can be calculated by the following formula:

$$K = 3 \pi r^2$$

Our online surface area of a hemisphere calculator first finds out the area of curved surface and base area, then adds them to find the total surface area of hemisphere.

## How to do the Hemisphere Calculations Manually:

The hemisphere calculations become very easy with this online tool. We have detailed formulas and manual examples of the calculation.

### Given V, Find r, A, C, K:

When the volume given, calculate the radius, curved surface area, circumference and total surface area with the following formula:

$$r = \text {cube root}\frac{3V}{2\pi}$$

Example:

The volume is 35ft3, find the radius, curved surface area, total surface area and circumference of the half circle?

Solution:

The formula used by this calculation is:

$$r = \text {cube root}\frac{3V}{2\pi}$$

$$r = \text {cube root}\frac{3(35)}{2(3.14)}$$

$$r = \text {cube root}\frac{105}{6.28}$$

$$r = \text {cube root}(16.71)$$

$$r = \text 2.55ft$$

To calculate curved surface area:

$$A = 2 \pi r^2$$

$$A = 2 (3.14) (2.55)^2$$

$$A = 2 (3.14) (6.50)$$

$$A = 41.08 ft^2$$

Now, the total surface area of hemisphere can be calculated from the following formula:

$$K = 3 \pi r^2$$

$$K = 3 (3.14) (2.55)^2$$

$$K = 3 (3.14) (6.50)$$

$$K = 61.62 ft^2$$

Now, use the formula for circumference to calculate it:

$$C = 2 \pi r$$

$$C = 2 (3.14) (2.55)$$

$$C = 16.04 ft$$

### Given A, Find r, V, C, K:

When the curved surface given, calculate the radius, volume, circumference and total surface area with the following formula:

$$r = \sqrt {(\frac{A}{2\pi})}$$

Example:

If the curved surface area is 46ft2, find the radius, volume, circumference & total surface area?

Solution:

The formula used to calculate radius from the above scenario is:

$$r = \sqrt {(\frac{A}{2\pi})}$$

$$r = \sqrt {(\frac{46}{2 (3.14)})}$$

$$r = \sqrt {(\frac{46}{6.28})}$$

$$r = \sqrt {7.32}$$

$$r = 2.70$$

To find volume of a hemisphere, the calculator uses the following formula:

$$V = \frac{2}{3}\pi r^3$$

$$V = \frac{2}{3}(3.14) (2.70)^3$$

$$V = \frac{2}{3}(3.14) (19.68)$$

$$V = \frac{2}{3}(61.80)$$

$$V = \frac{123.60}{3}$$

$$V = 41.49 ft^3$$

For calculation of circumference,

$$C = 2 \pi r$$

$$C = 2 (3.14) (2.70)$$

$$C = 17 ft$$

Now, total surface area is calculated as:

$$K = 3 \pi r^2$$

$$K = 3 (3.14) (2.70)^2$$

$$K = 3 (3.14) (7.29)$$

$$K = 69 ft^2$$

### Given K, Find r, V, A, C:

When the total surface area given, calculate the radius, volume, curved surface area and circumference with the following formula:

$$r = \sqrt {(\frac{K}{3\pi})}$$

Example:

The total surface area is 85ft2, then find out the radius & other different variables related to hemisphere?

Solution:

$$r = \sqrt {(\frac{K}{3\pi})}$$

$$r = \sqrt {(\frac{85}{3(3.14)})}$$

$$r = \sqrt {(\frac{85}{9.42})}$$

$$r = \sqrt {9.02}$$

$$r = 3 ft$$

To find the volume of hemisphere,

$$V = \frac{2}{3}\pi r^3$$

$$V = \frac{2}{3} (3.14) (3)^3$$

$$V = \frac{2}{3} (3.14) (27)$$

$$V = \frac{2}{3} (84.78)$$

$$V = \frac{169.56}{3}$$

$$V = 56.71 ft^3$$

For the calculation of curved surface area,

$$A = 2 \pi r^2$$

$$A = 2 (3.14) (3)^2$$

$$A = 2 (3.14) (9)$$

$$A = 56.62 ft^2$$

Now, the circumference is:

$$C = 2 \pi r$$

$$C = 2 (3.14) (3)$$

$$C = 18.86 ft$$

### Given C, Find r, V, A, K:

When the circumference is given, calculate the radius, volume, curved surface area and total surface area with the following formula:

$$r = \frac {C}{2(\pi)}$$

Example:

The circumference of the half circle is 25ft; find the radius, volume, curved surface area & total surface area of the hemisphere?

Solution:

$$r = \frac {C}{2(\pi)}$$

$$r = \frac {25}{2(3.14)}$$

$$r = \frac {25}{6.28}$$

$$r = 3.979ft$$

Now, to find the volume:

$$V = \frac{2}{3}\pi r^3$$

$$V = \frac{2}{3}(3.14) (3.979)^3$$

$$V = \frac{2}{3}(3.14) (62.99)$$

$$V = \frac{2}{3}(197.78)$$

$$V = \frac{395.56}{3}$$

$$V = 131.94 ft^3$$

The area of the curved surface is,

$$A = 2 \pi r^2$$

$$A = 2 (3.14) (3.979)^2$$

$$A = 2 (3.14) (15.83)$$

$$A = 99.47 ft^2$$

The total surface area of the hemisphere is:

$$K = 3 \pi r^2$$

$$K = 3 (3.14) (3.979)^2$$

$$K = 3 (3.14) (15.83)$$

$$K = 149.217ft^2$$

Also, you can use this online hemisphere calculator to verify all these calculations for your hemisphere problems.

## How to use the online Hemisphere calculator:

This free online calculator calculates the volume & surface area of the hemisphere by different 5 known parameters. Just stick to the points for the easy & speedy calculations.

Inputs:

• First of all, you have to select the known parameter from the dropdown of this tool.
• Then, enter the value of the known parameter according to the selected input.
• Very next, plug-in the number at which you want to round off the result.
• Finally, hit the calculate button.

Outputs:

Once you fill in all the fields of the hemisphere calculator, it will show:

• Base circumference.
• Volume.
• Curved surface area.
• Base surface area.
• Total surface area.
• Then, also tells all the calculations except radius in terms of Pi(ᴨ).

### What is a hemisphere?

When a plane passes through the centre or origin of the sphere & dividing it into two halves, then two half circles are created each is known as hemisphere. It includes the surface area of a curved surface as well as the area of base. As the hemisphere is half of the circle, so its volume is half of the volume of the sphere of corresponding radius.

### What is the TSA of the sphere?

A sphere is three-dimensional solid with a round shape, like circle. Total surface area (TSA) of a sphere can be found as:

$$Surface Area= 4 \pi r^2$$

### How do you find the diameter of a hemisphere?

The basic formula to calculate the diameter of the half circle is:

$$d= 2r$$

First of all, r is calculated according to the above mentioned calculation method with different known parameters.

### Why is it called Hemisphere?

The word comes from the Greek language and combines with the hemi prefix which means “half”. So, it means “the half of the sphere”. The Earth is divided into northern & Southern hemispheres.

## End-note:

The concept of hemisphere is of great significance in geometry to find out the volume & surface area of the solids, real life problems and for the benefits of Students and professionals. Simply, account this online hemisphere calculator that allows you to determine your hemisphere related problems accurately.

## References:

From the source of Wikipedia: Hemisphere, As half of the Earth, As half of the brain, and other.

From the source of nationalgeographic: All you need to explore about hemispheres

The site ck12 provides: Spheres and Hemi-spheres: Surface Area and Volume (ultimate and simple guide)