Select the correct answer to the GK question from the options given below it.

A. Greek mathematician

B. Contributor to the use of deductive principles of logic as the basis of geometry

C. Propounded the geometrical theorems

D. All of the above

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**D: All of the above.**

Euclid, sometimes called Euclid of Alexandria to distinguish him from Euclides of Megara, was a Greek mathematician, often referred to as the “father of geometry”. He was active in Alexandria during the reign of Ptolemy I (323–283 BCE). His Elements is one of the most influential works in the history of mathematics, serving as the main textbook for teaching mathematics (especially geometry) from the time of its publication until the late 19th or early 20th century. In the Elements, Euclid deduced the principles of what is now called Euclidean geometry from a small set of axioms. Euclid also wrote works on perspective, conic sections, spherical geometry, number theory and rigor.