# Mathematician:Bhāskara II Āchārya

## Contents

## Mathematician

**Bhāskara** (Kannada: **ಭಾಸ್ಕರಾಚಾರ್ಯ**) was an Indian mathematician and astronomer.

He is known as **Bhāskara II**, **Bhāskara Āchārya** ("Bhāskara the teacher"), or **Bhāskarāchārya**, to distinguish him from Bhāskara I).

## Nationality

Indian

## History

- Born: 1114 in Vijayapura, near Bijjada Bida (in present day Bijapur district, Karnataka state), South India
- Died: 1185 in Ujjain, India

## Theorems and Definitions

- A proof of Pythagoras' Theorem by dropping a perpendicular and investigating the relations between the ratios of the sides of the resulting similar triangles.

- A proof of Pythagoras' Theorem by calculating the same area in two different ways and then canceling out terms to get $a^2 + b^2 = c^2$.

- Solutions of quadratic, cubic and quartic indeterminate equations.

Results named for **Bhāskara II Āchārya** can be found here.

## Publications

All written in ca. 1150 B.C.E.:

*Līlāvatī*(about arithmetic)*Bijaganita*(about algebra)*Siddhanta Shiromani*which consists of two parts:*Goladhyaya*(sphere)*Grahaganita*(mathematics of the planets).

## Notable Quotes

*Behold!*- -- on demonstrating a proof of Pythagoras's Theorem

*The second value is in this case not to be taken, for it is inadequate; people do not approve of negative roots.*

## Sources

- John J. O'Connor and Edmund F. Robertson: "Bhāskara II Āchārya": MacTutor History of Mathematics archive

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): A List of Mathematicians in Chronological Sequence - 1992: George F. Simmons:
*Calculus Gems*... (previous) ... (next): Chapter $\text {B}.1$: The Pythagorean Theorem - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): A List of Mathematicians in Chronological Sequence - 2008: Ian Stewart:
*Taming the Infinite*... (previous) ... (next): Chapter $3$: Notations and Numbers