Posted by vit on Monday, December 19, 2011 at 8:55pm.
draw a pair of vertical angles with a measure of 40. create and label the vertical angles with algebraic expressions involving x.

Geometry  Steve, Tuesday, December 20, 2011 at 4:31am
sorry, can't do diagrams here.
You might label one angle x+20, and the other 2x. Then, solving the equation would reveal that the angle has measure 40.
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