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Why straight angle id 180Is it prove or axiom |
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Answer» start with the 90 degree right angle JKL. If we continue to bend JK all the way down to a straight line, that would be twice of 90, or 180. Continue bending JK all the way back to KL, and you have a complete circle, 360 degrees. Now, why is there such an odd number as 360 degrees in a circle? Basically, because it was observed thousands of years ago (about 2400 BC) that it takes 360 days for the Sun to make one complete yearly cycle. A thousand years later, the Egyptians divided each day into 24 hours, and another thousand or so years later the Babylonians subdivided the hour into 60 minutes and the minutes into 60 seconds. Obviously we know now that it actually takes 365 1/4 days for the earth to revolve around the sun. But I'm perfectly happy without 365 1/4 degrees in a circle. |
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