# SSC Mathematics Note 6th Chapter Lines, Angles, and Triangles

SSC Mathematics Note 6th Chapter Lines, Angles, and Triangles. Geometry is an old branch of mathematics.  The word ‘geometry’ comes from the Greek words ‘geo’, meaning the ‘earth’, and ‘metrein’, meaning ‘to measure’. So, the word ‘geometry’ means ‘the measurement of land.’ Geometry appears to have originated from the need for measuring land in the age of agricultural based civilization. However, nowadays geometry is not only used for measuring lands, rather a knowledge of geometry is now indispensable for solving many complicated mathematical problems.  The practice of geometry is evident in relics of an ancient civilization.

## SSC Mathematics Note 6th Chapter Lines, Angles, and Triangles

According to the historians, concepts and ideas of geometry were applied to the survey of lands about four thousand years ago in ancient Egypt. Signs of application of geometry are visible in different practical works of ancient Egypt, Babylon, India, China, and the Incas civilization.  In the Indian subcontinent, there were extensive usages of geometry in the Indus Valley civilization. The excavations at Harappa and Mohenjo-Daro show the evidence that there was a well-planned city. For example, the roads were parallel to each other and there was a developed underground drainage system.  Besides the shape of houses shows that the town dwellers were skilled in mensuration. In the Vedic period in the construction of altars (or vedis) definite geometrical shapes and areas were maintained.  Usually, these were constituted with triangles, quadrilaterals, and trapeziums.

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