guyz can u suggest me a working model for class 10?

Question

it should be cool looking.
cab be of any topic but should be impressive.
u can also give me topic on probablity or circles

Answer 1

I don't know what "class 10" is, but here's a sample of how to combine probability AND circles:

Set up a 2'x2' square dartboard, with a 2' diameter (1' radius) circle drawn inside it. The circle will just fit and be centered at the center of the square. Throw darts randomly at the square, counting the total number of darts that actually hit the square (n1) and the number of those darts that also hit inside the circle (n2). If your throws are truly random in that every square inch of the target has an equal probability of being hit, then the ratio n2/n1 will be an approximation of pi/4. Or:
pi ~= 4*n2/n1

For more accuracy, throw more darts.

This is an example of what's called the "Monte Carlo" method. Similar ideas were used (without the dartboard :^) to perform key calculations in the development of the first atomic bomb.