Brahmagupta is widely regarded as the 'Father of Indian Geometry' for his significant contributions to the field.

Baudhayana is credited with developing the 'Sulbasutras', a collection of mathematical rules and formulas used in ancient India for constructing altars and other religious structures.

Pythagoras' Theorem is a well-known theorem in geometry that establishes the relationship between the sides of a right triangle.

Brahmagupta discovered the formula for calculating the area of a triangle, which is given by (1/2) * base * height.

Bhaskara I developed the concept of 'cyclic quadrilaterals', which are quadrilaterals whose vertices lie on a circle.

The Angle Sum Theorem states that the sum of the interior angles of a triangle is always equal to 180 degrees.

Aryabhata developed the concept of 'trigonometric functions', which are used to calculate angles and distances in triangles.

Thales' Theorem states that the ratio of the sides of a similar triangle is equal to the ratio of their corresponding altitudes.

Aryabhata developed the concept of 'geometric progressions', which are sequences of numbers where each term is obtained by multiplying the previous term by a constant factor.

The Area of a Circle Theorem states that the area of a circle is equal to pi multiplied by the square of its radius.

Brahmagupta developed the concept of 'conic sections', which are curves formed by the intersection of a plane and a cone.

The Angle Sum Theorem for Quadrilaterals states that the sum of the angles of a quadrilateral is always equal to 360 degrees.

Bhaskara II developed the concept of 'Pascal's triangle', which is a triangular array of binomial coefficients.

The Area of a Parallelogram Theorem states that the area of a parallelogram is equal to the product of its base and height.

Varahamihira developed the concept of 'magic squares', which are square grids filled with numbers in such a way that the sum of each row, column, and diagonal is the same.