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The introduction to this article describes the Himalayan mountain range, while the next chapter outlines its formation. The article then goes on to describe the early use of trigonometric networks in Europe and India, and the important achievements of Sir George Everest. When his successor, A. S. Waugh, extended the trigonometric network to the foot of the Himalayas, he determined the height of the highest peak of Mt. Everest trigonometrically, by measuring vertical angles only in the directiondoaj:57ef1f95a3074b3cb7cf8f5774693116 fatcat:3zi4kkxptfdbjdzm5qu4w6shom