Trigonometry expanded

Abbasid Caliphate

Trigonometry expanded ©Image Attribution forthcoming. Image belongs to the respective owner(s).

830 Jan 1

Trigonometry expanded

Baghdad, Iraq

Habash_al-Hasib_al-Marwazi described the trigonometric ratios: sine, cosine, tangent and cotangent

Ask Herodotus

Do you have a question about this event or anything History related?

HistoryMaps Shop

Heroes of the American Revolution Painting

Explore the rich history of the American Revolution through this captivating painting of the Continental Army. Perfect for history enthusiasts and art collectors, this piece brings to life the bravery and struggles of early American soldiers.

Page last updated: Mon Aug 29 2022

Shop Now

Support HM Project

There are several ways to support the HistoryMaps Project.

Shop Now

Donate

Support Page

New & Updated

HistoryMaps

History of Ireland

Articles

Migration of Early Modern Humans

Geopolitical Theories

Life in a Medieval Village

Logistics during the American Civil War

Art of War of the Byzantine Empire

Naval Warfare during the American Revolution

Feedback

We value your feedback. If you find any missing, misleading, or false information, please let us know. Please cite the specific story and event, briefly explain the issue, and (if possible) include your source(s). Also, if you encounter any content on our site you suspect might infringe copyright protections, do let us know. We are committed to respecting intellectual property rights and will promptly address any issues raised. Thank you.