Your iPad has a fault - and requires attention. Ensure that the iPad is disconnected from its Power Adapter and all accessories. If the iPad is switched off, leave it off - and move the iPad to somewhere cool away from all flammable materials. Consider moving the iPad outside keeping the iPad somewhere dry.
When the iPad has cooled, you should take it to the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to assess your iPad:
Genius Bar Reservation and Apple Support Options - Apple
You can also seek assistance directly from from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page.