Puttaswamy, Mathematical achievements of pre-modern Indian mathematicians , Elsevier, , p. Apostol and Mamikon A. Mnatsakanian December American Mathematical Monthly.

Capinera 11 August Encyclopedia of Entomology. Polygons List. Categories : Elementary shapes Types of quadrilaterals. Hidden categories: All articles with dead external links Articles with dead external links from March Use American English from August All Wikipedia articles written in American English Articles with short description Short description matches Wikidata All accuracy disputes Articles with disputed statements from March Namespaces Article Talk.

Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. Wikimedia Commons Wikibooks. Trapezoid or trapezium. A trapezoid is an interesting four-sided geometric figure. It has two parallel sides and the remaining two sides can be of any length, at any angle. Some possible trapezoid shapes are shown below to clarify the concept. Notice that the parallel lines are marked with arrows. In real life there are a lot of objects with trapezoid shapes that you may or may not have noticed.

See some examples below. Vocational Training. Standardized Tests. Online Learning. Social Sciences. Legal Studies. Political Science. Thus, represents 60 plus 23, or However, the number 60 was represented by the same symbol as the number 1 and, because they lacked an equivalent of the decimal point, the actual place value of a symbol often had to be inferred from the context.

It has been conjectured that Babylonian advances in mathematics were probably facilitated by the fact that 60 has many divisors 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60 — in fact, 60 is the smallest integer divisible by all integers from 1 to 6 , and the continued modern-day usage of of 60 seconds in a minute, 60 minutes in an hour, and 60 x 6 degrees in a circle, are all testaments to the ancient Babylonian system.

It is for similar reasons that 12 which has factors of 1, 2, 3, 4 and 6 has been such a popular multiple historically e. The Babylonians also developed another revolutionary mathematical concept , something else that the Egyptians , Greeks and Romans did not have, a circle character for zero, although its symbol was really still more of a placeholder than a number in its own right. We have evidence of the development of a complex system of metrology in Sumer from about BCE , and multiplication and reciprocal division tables, tables of squares, square roots and cube roots, geometrical exercises and division problems from around BCE onwards.

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