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Brahmagupta is widely regarded as the father of Indian geometry for his significant contributions to the field, including his work on the Pythagorean theorem and the Brahmagupta formula.

Brahmagupta's theorem is a fundamental result in geometry that establishes a relationship between the diagonals and sides of a cyclic quadrilateral.

Bhaskara II is credited with developing the formula for calculating the area of a triangle using its semi-perimeter, known as Heron's formula.

Varahamihira's theorem, also known as the angle sum property of a triangle, states that the sum of the angles of a triangle is always equal to 180 degrees.

Aryabhata made significant contributions to the construction of regular polygons, including developing methods for constructing regular pentagons and hexagons.

Bhaskara's theorem, also known as the area of a circle formula, provides a method for calculating the area of a circle using its radius.

Aryabhata developed a method for calculating the volume of a sphere, which was later refined by Brahmagupta and Bhaskara II.

Varahamihira's theorem, also known as the volume of a pyramid formula, provides a method for calculating the volume of a pyramid using its base area and height.

Brahmagupta is renowned for his work on the construction of magic squares, which are square grids filled with numbers such that the sum of each row, column, and diagonal is the same.

Bhaskara's theorem, also known as the angle sum property of a polygon, provides a formula for calculating the sum of the interior angles of a polygon based on the number of sides.

Aryabhata developed a method for calculating the circumference of a circle, which was later refined by Brahmagupta and Bhaskara II.

Brahmagupta's theorem, also known as the area of a triangle formula, provides a method for calculating the area of a triangle using its base and height.

Bhaskara II made significant contributions to the construction of conic sections, including developing methods for constructing parabolas, ellipses, and hyperbolas.

The Pythagorean theorem is a fundamental result in geometry that establishes a relationship between the sides of a right triangle.

Aryabhata made significant contributions to the construction of regular polyhedra, including developing methods for constructing the five Platonic solids.