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Joined: Oct 16, 2011
June 15th, 2015 at 5:33:51 AM permalink
Quote: DoubleOrNothing

Draw a line from the lower left corner parallel to the line above the angle in question to form a trapezoid.

[20°+(60°-x)]+[x+40°]+[180°-(x+40°)]+[(180°-70°-x)+50°]=360° --> x=30°.

How you get first term [20 +(60-x)] ? I thought should be [20 +x] ?

I agreed with the last three terms.
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