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4 2very 2 If two lines have any part common what must follows Mp A Blother through out and make but am they must with each one and the same straight line Question How can this, of the two lines CA. B M which part MA A common answer The common part m A be longs little line M 13 as well as both line A6 and therefore mc and as N are, inthiscase but the continuation of the same straight line AM * Turry 3 How greater is the sum of the too ajacent angles which are formed by one straight line meeting another taking a right dugle for the measure Question you do you prove answer It is equal to two right angles M this of the two wagles ED GDE formed by the line Ats A C meeting the line AC at the D point D Answer Because if alD your erect the A D 8 and BDE /ocenpy exactly the same perpendicular D Mr. the angly and M forned by the meeting ofthe space 6D as the two mg ht angles AD m maniely all the space on one side of b.A

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