29. Known as Beta to his students, he was the chief librarian in Alexandria. He was a philosopher, poet, historian, astronomer, and mathematician. He invented the Julian calendar and his greatest achievement was a remarkably accurate calculation of the circumference of the earth.

A. Archimedes B. Eudoxus C. Eratosthenes D. Hippias E. NOTA

30. This Hindu mathematician studied Diophantine equations, calculated

the surface area and volume of pyramids and cones using --,,rI-O as an approximation for 7r . He also discovered the formula for the area of a cyclic quadrilateral, a generalization of Heron's formula.

A. Bhaskara B. Aryabhata C. Mahavira D. Brahmagupta E. NOTA