Brahmagupta is widely regarded as one of the greatest mathematicians of ancient India and is known for his significant contributions to geometry, including his work on quadrilaterals, circles, and the Pythagorean theorem.

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

Heron's formula is a well-known result in geometry that provides a method for calculating the area of a triangle using its side lengths.

Aryabhata is credited with developing methods for constructing regular polygons, including the construction of a regular pentagon and a regular hexagon.

The angle sum property of a triangle is a fundamental result in geometry that establishes a relationship between the interior angles of a triangle.

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

The area of a circle formula is a well-known result in geometry that provides a method for calculating the area of a circle using its radius.

Pythagoras is known for his work on the concept of the Pythagorean triple, which is a set of three positive integers that satisfy the Pythagorean theorem.

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

Aryabhata is known for his work on the concept of the golden ratio, which is an irrational number approximately equal to 1.618.

The rhombus diagonal theorem is a result in geometry that establishes a relationship between the diagonals of a rhombus.

Aryabhata is known for his work on the concept of the regular polygon, which is a polygon with all sides and angles equal.

The triangle area formula is a well-known result in geometry that provides a method for calculating the area of a triangle using its base and height.

Aryabhata is known for his work on the concept of the circle, including his calculation of the value of pi.

The angle sum property of a quadrilateral is a result in geometry that establishes a relationship between the interior angles of a quadrilateral.