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Angles Review Angle CMB = Angle AMD Angle AMD + Angle CMA = 180o Example of SAT question with angles:In the figure below, angle AMB is 100o, angle BMD is 40o and angle CME is 60o. What is the value of angle CMD? Figure not drawn to scale 20o 30o 40o 50o 80o Answer: If angle AMB is 100o, then angle BME is 180o - 100o = 80o BMC + CMD = 40o BMC + CMD + DME = 80o If we subtract the 2 equations, DME = 40o CMD + DME = 60o BMC + CMD + DME = 80o If we subtract the 2 equations, BMC = 20o CMD = BME - BMC - DME = 80o - 40o - 20o = 20o Parallel Lines Review If the 2 horizontal lines are parallel, - angles 1 = 3 = 5 = 7 and - angles 2 = 4 = 6 = 8 Polygons Review The sum of the measures of the interior angles of a triangle is 180. a + b + c = 180o The sum of the measures of the interior angles of a polygon is: 180o n = number of sides of the polygon. | 
