I have an IPad 6th generation and while using it it gets very hot?

See this support article:--> If your iPhone, iPad, or iPod touch gets too hot or too cold - Apple Support

If you still think it's becoming too hot, since your iPad is still covered by warranty, make an appointment (*) and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector. After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.

It is not unusual for an iPad to become warm when being used - more so when using some types of iPad case. High screen brightness and/or CPU intensive Apps will also create more heat.

Sometimes a suck/hung App or background process can cause the device to run hotter (or considerably hotter) than normal - a condition that can often be resolved with a simple forced-restart of the device. To force-restart your iPad:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

The key point is that whilst your iPad may become very warm in normal use, the iPad should not become uncomfortably hot to handle. If your iPad is becoming too hot to hold - and a forced-restart does not resolve the problem - you should take your iPad along to the Genius Bar at your local Apple Store where the technicians can examine and test your iPad for faults.

Genius Bar Reservation and Apple Support Options - Apple