If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

Can you place three balls such that the equation shown in the picture holds true?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

John is the son of Jacob.
So,
Jacob is the_____of John's father?