Aryabhata is widely regarded as one of the greatest Indian mathematicians of all time. He lived in the 5th century CE and made significant contributions to various fields of mathematics, including geometry.

Brahmagupta is known for his work on the concept of the cyclic quadrilateral, which is a quadrilateral whose vertices lie on a circle.

The Angle Sum Theorem states that the sum of the angles of a triangle is equal to 180 degrees. This theorem is attributed to Indian mathematicians.

Pythagoras is known for his work on the concept of the Pythagorean triples, which are sets of three positive integers that satisfy the equation a^2 + b^2 = c^2.

Heron's Formula states that the area of a triangle is equal to half the product of its base and height. This formula is attributed to Indian mathematicians.

Brahmagupta is known for his work on the concept of the Brahmagupta's identity, which is a formula for finding the area of a cyclic quadrilateral.

Brahmagupta's Identity states that the sum of the squares of the diagonals of a parallelogram is equal to the sum of the squares of its sides. This theorem is attributed to Indian mathematicians.

Bhaskara II is known for his work on the concept of the Bhaskara's formula, which is a formula for finding the area of a triangle.

The Area of a Circle Formula states that the area of a circle is equal to pi multiplied by the square of its radius. This formula is attributed to Indian mathematicians.

Aryabhata is known for his work on the concept of the volume of a sphere. He derived a formula for finding the volume of a sphere, which is V = (4/3) * pi * r^3.

The Volume of a Pyramid Formula states that the volume of a pyramid is equal to one-third the product of its base area and height. This formula is attributed to Indian mathematicians.

Bhaskara II is known for his work on the concept of the volume of a cone. He derived a formula for finding the volume of a cone, which is V = (1/3) * pi * r^2 * h.

The Volume of a Sphere Formula states that the volume of a sphere is equal to two-thirds the product of its surface area and radius. This formula is attributed to Indian mathematicians.

Aryabhata is known for his work on the concept of the surface area of a sphere. He derived a formula for finding the surface area of a sphere, which is A = 4 * pi * r^2.

The Surface Area of a Cone Formula states that the surface area of a cone is equal to the sum of the areas of its base and its lateral surface. This formula is attributed to Indian mathematicians.