How many sides does a circle have?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

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

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What Does this text mean:

important=important

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

I look at you, you look at me, I raise my right, you raise your left. What am I?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?