Which set of numbers may represent the lengths of the sides of a right triangle and why?
a) 7,8.10
b) 5,5,10
c) 5,12,13
d) 4,5,6

In a box lenght 1m breadth 60 cm and height 40 cm small rectangular packets of dimension 5 cm into 8 cm into 10 cm are packed. how many such small packets can be packed in the big box?

We just started the introduction into circles and i have no idea how to do this.

Twelve less than a number is at most 20