## Change Motion Wallpaper on Samsung Galaxy S8

The feature allows the lock screen wallpaper to change to different effects when you tilt your phone in different directions.

**What is circle?**

In terms of the plane, the circle is the area limited internally by a circle. Center, the radius of the circle is the center, the radius of the surrounding circle.

Calculate the area of a circle is to calculate the area inside the circle.

*The pink part is the area of the circle*

The area of a circle is calculated by the formula: **Square radius of circle multiplied by Pi** .

*The formula for calculating the area of a circle*

**Inside:**

**+ r** : Radius of a circle

**+ π** : Constant Pi (π = 3.14)

The formula for the area of a circle helps you calculate the total surface area inside the circle.

The circumference of a circle, also known as the length of a circle, is the boundary line separating the inside from the outside of the circle.

*Circumference is the length of the circle*

The circumference of the circle is calculated using the formula: **Diameter multiplied by Pi or twice the radius multiplied by Pi** .

*Formula to calculate the circumference of a circle*

**In which** :

**+ r** : Radius of a circle

**+ d** : Diameter of circle

**+ π** : Constant Pi (π = 3.14)

Because circles cannot be measured with a ruler, you can use the circumference of a circle to get the length of the circle.

A circular fan shape is a part of a circle limited by two radii and an arc shielded by these two radii.

*The blue part is the circular fan-shaped area*

The area of a round fan is calculated by the formula:

*The formula for calculating the area of a round fan*

**In which** :

**+ r** : Radius of a circle

**+ π** : Constant Pi (π = 3.14)

**+ l** : The length of the arc

The fan-shaped area formula makes it easy to calculate the area of the part of the plane inside the circle.

**See also** :

>>> Synthesize a table of full, detailed and easy-to-understand trigonometric formulas

>>> The formula for calculating the area of a trapezoid, trapezoidal perimeter fully understandable

*Above are the formulas to calculate the perimeter, the area of a circle and the circle fan. Thank you for watching and see you in the following articles.*

The feature allows the lock screen wallpaper to change to different effects when you tilt your phone in different directions.

In some special cases you need to save the call recordings.

You can connect your phone to your computer via a USB cable to retrieve and copy data.

A data connection will help you stay connected wherever you are without Wi-Fi.

You can change the default sounds for incoming calls with your own downloaded songs.

Translate words with the S Pen is to use the pen's translation feature to translate the words you want.

Optimize your device by automatically restarting with the set time. Any unsaved data will be lost when the device reboots.

The feature helps you check to be able to download the latest operating system upgrades for your device.

Note on the Note 8's screen off is to use the S Pen to take notes directly on the screen even when the screen is off.

Displaying battery percentage in the status bar makes it easy to control how much battery you are using.

You can change the default sounds when a call comes in with your favorite music.

Connecting your computer to your phone helps you copy data back and forth in the simplest way.

The device displays a data usage warning message with a triangle icon with an exclamation point and cannot use 4G or 3G. What to do next to fix?

OTG connection helps to support connection with peripheral devices such as mouse, USB, keyboard...

Since the Note series, the S Pen has been a handy accessory with many functions indispensable for Samsung users.

Samsung Pay After becoming a popular payment platform in developed countries such as the US, Singapore, and South Korea, Samsung has officially introduced Samsung Pay service to Vietnam market.<!--{cke_protected}% 3Cmeta%20charset%3D%22utf-8%22%20%2F%3E-->

Controlling photography by voice on the Samsung Galaxy Grand Prime is an interesting feature, you will not need to use the key on the device and still take pictures.

Samsung Galaxy J7 screen brightness setting helps you to set the time when the device will automatically turn off when not in use.

You delete photos and videos, but automatically it's all restored back to your phone. What is the cause and how to turn it off?

Recently, many smartphone users, especially Samsung, have a magnifying glass icon on the screen. What is that icon and how to turn it off?