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

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

what does this picture(rebus) riddle means ?

Why is the longest human nose just 11 inches?

Why Wine Glass Stem is so long?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

Why did the Girl throw the butter out of the window?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

When it's bad luck to meet a black cat?