Al-Kashi made significant contributions to algebra and trigonometry in the 15th century. He was the first to explicitly state the law of cosines, useful for triangulation. He also calculated pi more accurately in his famous Treatise on the Circumference completed in 1424.

1. a)Write a brief summary ofAl-Kashicontributions in Algebra and Trigonometry.(2 lines)
a)Write a brief summary ofAl-Kashicontributions in Algebra and Trigonometry.(2 lines)
a)Write a brief summary ofAl-Kashicontributions in Algebra and Trigonometry.(2 lines)
Solution
al-Kashi was the first to provide an explicit statement of the law of cosines in a form suitable for
triangulation. In 1424 CE al-Kashi finished his most famous work, the Risala al-muhitiyya
(Treatise on the Circumference). In it he calculated pi, (the ratio of a circle