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OpenStudy (sethzk):
In the figure below, 1 and 2 are adjacent angles: Write an indirect proof proving that the sum of 1 and 2 is 180°.
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OpenStudy (sethzk):
OpenStudy (sethzk):
help?
OpenStudy (sethzk):
???
OpenStudy (zavier10):
180 - angle 1 = angle 2 (straight line) 180 = angle 1 + angle 2 (bring angle 1 to the other side of the equation)
OpenStudy (alexandervonhumboldt2):
Assume that m<1+m<2 is not equal to 180. CA and CB are opposite rays. <1 and <2 are adjacent angles . 1 and < 2 are supplementary => m<1+m<2 = 180 . => the assumption m<1+m<2 is not 180 is false. =>the sum of two adjacent angles is 180.
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