Complete the sentence about Jamshid al-Kashi with the correct year: Al-Kashi was still working on his book, called “Risala al-watar wa’l-jaib” meaning “The Treatise on the Chord and Sine”, when he died, in ______.

Answer and explanation

Correct answer: B. 1429

Al-Kashi was still working on his book, called Risala al-watar wa'l-jaib, The Treatise on the Chord and Sine, when he died in 1429. It was unfinished.

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