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

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What breaks yet never falls, and what falls yet never breaks?

Can you count the number of triangles in the given figure?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

Count the number of triangles in the picture below:

What runs around the whole yard without moving?