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

Why Wine Glass Stem is so long?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

A solo dice game is played. In this game, upon each turn, a normal pair of dice is rolled and the score is calculated not by adding the numbers but multiplying them.

In a particular game, the score for the second roll is five more than what was achieved in the first roll. The score for the third roll is six less than what was completed in the second roll. The score for the fourth roll is eleven more than what was achieved in the third. The score for the fifth roll is eight less than what was completed in the fourth.

Can you calculate the score for each of the five throws?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

How many sides does a circle have?

Count the number of triangles in the below picture?

I am quite hot but become too cold if you remove the first two letters. What am I?