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

What word is pronounced the same if you take away four of its five letters?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Solve the puzzle by telling what does below picture means.

What can you deduce from the following BrainBat?

CRY
LMKI

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

Can you spot the hidden girl in the picture below?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?