Brahmagupta

Brahmagupta was a very smart man who lived a long time ago in India. He was a mathematician and astronomer, which means he really liked numbers and studying the sky.

One of the things Brahmagupta is famous for is a formula he came up with for finding the area of a quadrilateral. A quadrilateral is a shape with four sides, like a square or a rectangle. His formula helps us figure out how much space is inside a quadrilateral, even if it's not a regular shape.

Another thing Brahmagupta is known for is his work with negative numbers. Sometimes we use numbers that are less than zero, and this can be confusing! But Brahmagupta was able to figure out rules for adding and subtracting negative numbers, so that we can solve problems that involve them.

Overall, Brahmagupta was a very clever person who helped make math easier to understand for lots of people.