Solve This (? + ? + ?=30)

If 1111=R, 2222=T, 3333=E, 4444=N Then 5555=?

Guess the Hindi Muhawara from the following whatsapp Emoticons?

Sweet, Medicine, Film, Girl, City, Car, Place, Doggy all are name same, guess which word it is?

A girl is blind, deaf, dumb and uneducated too. A boy loves her. How would he propose without touching her?

The ans is - 11

"The sum of the squares of the lengths of the four sides of a parallelogram equals the sum of the squares of the lengths of the two diagonals" is known as what?