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- Jul 17th 2009, 04:17 PM #1

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- Jul 2009
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- Jul 17th 2009, 04:33 PM #2

- Jul 17th 2009, 04:36 PM #3

- Jul 17th 2009, 04:51 PM #4
note that by drawing the third parallel line, angle x is cut into two smaller angles.

one of the smaller angles forms an alternate-interior pair with the 50 degree angle, the other forms an alternate-interior pair with the 30 degree angle.

the two angles (50+30) sum to be the value of x.