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

What goes up but never comes down?

What number divided by 4 is the same as that number minus 4?

Decode below rebus
D
N
A
T
S , D

In the image below, can you find the value of an angle(y)

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?