Option c is the correct answer. Bhaskara was a 12th-century mathematician and astronomer who wrote several works on mathematics particularly Algerbra and astronomy, such as the Siddhantasiromani and the Lilavati. Important Tips Some of Bhaskara's important findings: He solved indeterminate equations of the first and second degree using the method of kuttaka ( transl. 'pulverizer'), which is similar to the modern method of continued fractions. He gave a general formula for solving quadratic equations and also solved cubic and quartic equations using numerical methods. He gave proof of the Pythagorean theorem and derived the formula for the area of a cyclic quadrilateral. He gave an approximation of the value of pi as 3.1416 , which is accurate up to four decimal places. He gave a method for finding the sine of an angle using a table of differences. He gave a method for finding the square root of a number using successive approximations.