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The first time the symbol Pi was first used for Pi was in ancient Greece in their numbers. The symbol "π" was number 80 in Greece.
When you multiply pi times 25, the answer is: 78.53981625
Area of a circle, A = (pi)(r^2). Since the d = 10, then r = 10/2 = 5. So A = (pi)(5^2)= 25(pi) or A = 25(3.141) = 78.525.
Area = (pi) R2 = (pi) (1/2 diameter)2 = 25 pi = 78.54square feet (rounded)
The Hindus created PI