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Trigonometry, in the form of a table of chord lengths in a circle, was probably used by Claudius Ptolemy of Alexandria to obtain the value of π given in the Almagest (circa 150 CE). [ 69 ] Advances in the approximation of π (when the methods are known) were made by increasing the number of sides of the polygons used in the computation.
The general form that the ranges take is: from the west, a series of low-angled sandstone ridges running roughly north–south. The eastern sides of the ridges, where the sedimentary layers have faulted, are steep and beyond the vertical in place - notably at Hollow Mountain near Dadswells Bridge at the northern end of the ranges.
The Solar System [d] is the gravitationally bound system of the Sun and the objects that orbit it. [11] It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.