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

Why 1729 is a magic number? Answer Logically.

What does this mathematical rebus means ?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

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

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den