The image above is a **semicircleÂ **with a radius of 7 cm. To calculate the centroid or centre of gravity of a semicircle, you need one essential parameter and this parameter is the radius of the semicircle.

The formula for calculating the centroid or centre of gravity of a semicircle is:

C.G.= ^{4r} / _{3Ï€}

Where:

r = Radius of the Semicircle

Ï€ = Mathematical Constant = 3.142 (approximately)

Let’s solve an example:

Find the centroid or centre of gravity of a semicircle where the radius is 7 cm.

From the example above,

r = radius of the semicircle = 7

C.G. = ^{4(7)} / _{3Ï€}

C.G. = ^{28} / _{9.4247}

Then, C.G. = 2.97

Therefore, the **centroid or centre of gravity of the semicircle** is **2.97**.

### How to Calculate the Centre of Gravity of a Semicircle with Nickzom Calculator

Nickzom Calculator â€“Â **The Calculator Encyclopedia**Â is capable of calculating the centre of gravity of a semicircle at a distance from its base measured along the vertical radius.

To get the answer and workings of theÂ **center of gravity**Â orÂ **centroidÂ **of a semicircle using theÂ **Nickzom Calculator â€“ The Calculator Encyclopedia.Â **First, you need to obtain the app.

You can get this app via any of these means:

**Web**Â â€“Â https://www.nickzom.org/calculator-plus

To get access to theÂ **professionalÂ **version via web, you need toÂ **register**Â andÂ **subscribeÂ **for**Â NGN 1,500Â **per**Â annum**Â to have utter access to all functionalities.

You can also try theÂ **demoÂ **version viaÂ https://www.nickzom.org/calculator

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**Android (Paid)**Â â€“Â https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)**Â â€“Â https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)**Â â€“Â https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to theÂ **Calculator Map,Â **then click onÂ **Mechanics****Â **under theÂ **Engineering**Â section

Now, click onÂ **Centre of Gravity**Â underÂ **Statics**

Now, click onÂ **Centre of Gravity of a Semicircle**

The screenshot below displays the page or activity to enter your value, to get the answer for the centre of gravity of a semicircle according to the respective parameter which is the radius of the semicircle (r).

Now, enter the value appropriately and accordingly for the parameter as required by theÂ **example**Â above where the **radius of the semicircle** is **7**.

Finally, click on **Calculate**

As you can see from the screenshot above,Â **Nickzom Calculator**Â â€“ The Calculator Encyclopedia solves for the centre of gravity or centroid of a semicircle and presents the formula, workings and steps too.