Mathematics in Human Affairs

abacus algebra altitude answer approximately Archimedes arithmetic base Brahmagupta calculate called cents century chapter circle cosine decimal point degrees diameter digits Diophantus distance divided earth Egyptians equal equation Eratosthenes Euclid example exponent expressed feet following key formula four fraction function geometry given graph Greek Hence Hindus hypotenuse inches indicated integers interest latitude law of sines length light-year logarithms mathematicians mathematics means measure method miles multiplied notation number system obtained parallel parsec period perpendicular plane positive problem Pythagoras Pythagorean theorem quadratic radians radius ratio represent result right angles right triangle rule scientific notation shown in Figure side significant figures Solution solve square root Star straight Study Guide Substituting Subtracting symbols tangent Thales theorem third tion units unknown write