Forty-five is a triangular number, and in particular the sum of all the decimal digits (0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45).It is the smallest triangle number (after 1) which can be written as the sum of two squares. It is also a hexagonal and 16-gonal number.
A football match consists of two periods of 45 minutes each.
The maximum mark an International Baccalaureate student can obtain.
A football match consists of two periods of 45 minutes each.
The maximum mark an International Baccalaureate student can obtain.