The astrolabe, gnomon, and quadrant were all used in ancient India for measuring angles.

The Sulba Sutras are a collection of ancient Indian texts that deal with geometry, particularly the construction of altars and other religious structures.

The Bakhshali Manuscript is a collection of ancient Indian mathematical texts that contains arithmetic, including fractions, square roots, and quadratic equations.

Aryabhata developed methods for solving quadratic equations, calculating the area of a triangle, and finding the volume of a sphere.

Brahmagupta developed methods for solving cubic equations, calculating the circumference of a circle, and finding the area of a quadrilateral.

Bhaskara II developed methods for solving quartic equations, calculating the area of a circle, and finding the volume of a sphere.

Madhava developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Nilakantha developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Jyeshtadeva developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Mahavira developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Sridhara developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Bhaskara I developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Varahamihira developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Brahmagupta developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.

Aryabhata developed methods for calculating the value of pi, developing the Taylor series, and finding the area of a circle.