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

I travel all around the world but always stay in the corner. What am I?

If your uncle’s sister is not your aunt, what relation is she to you?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?

Remove two matchsticks to make the below equation correct.

12345 a famous South Indian actor
567 is a path in jumbled form
8 & 10 are same letters
9 is one among the first six alphabets.
WHO AM I?

I cannot talk, but I always reply when spoken to. What am I?

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?