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A kind of plane trigonometry had been known to the ancient Egyptians.

At least at the start of college, Mr. Perry did not make any F’s, turning in mostly C’s along with a smattering of B’s and one A as well as one D, which he received for a class in plane trigonometry during the spring semester of 1969, according to a copy of his transcript obtained by The Huffington Post.

The subjects of tuition in the Higher Gewerb, or technical schools, are, on the contrary, mathematics, algebra, plane trigonometry, analytical geometry in all its branches and modes of practical application; higher algebra, differential and integral calculus, plan-drawing and machine-drawing, botany and zoology, and physiology of plants, geognosy, geology; experimental chemistry, technical chemistry, analytical chemistry, practical chemical operations; mineralogy; mechanics, statistic and dynamic, experimental physics, free hand-drawing, modelling in wood and metal, and instruction in German, French, English and Latin languages, and history.

His little poems were making their way into public notice and his more serious work had been “Notes on the First Two Books of Euclid,” “Text-Books on Plane Geometry and Plane Trigonometry,” and “Notes on the First Part of Algebra.”

The harbour plans and coast sheets are constructed on the simple principles of plane trigonometry by the surveying officers.