Hello..here u wrote
a=b But that's not correct I think..because a and b are interior angles and interior angles are not equal . ...that is the measure of interior angle is 180° so they are not equal solve it again....!!!!
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Answer:
Hello......
Please don't recommend me BY-JU'S as I am fed up with that .....
I had tried it earlier..... it's going to be 1 year.....I think....
The various source material used for studying tribal history is official document ,gazettes , newspaper,and biographies of the recent year.The historical sources can be of two types, i.e. Primary and Secondary Sources. A primary source is the evidence of an eye witness or mechanical device which was present at the time of the occurrence of an event.They use oral traditions and rich customs of the tribal people to write their (tribals') histories. 1.Primary & Secondary Sources
Primary sources may include diaries, letters, interviews, oral histories, photographs, newspaper articles, government documents, poems, novels, plays, and music. The collection and analysis of primary sources is central to historical research.Primary sources help students relate in a personal way to events of the past and promote a deeper understanding of history as a series of human events. Because primary sources are incomplete snippets of history, each one represents a mystery that students can only explore further by finding new pieces of evidence.