SAT考试几何部分常用公式_无忧雅思网_雅思预测_雅思机经_雅思考试_雅思资料下载_雅思名师

Angles Review

Angle CMB = Angle AMD
Angle AMD + Angle CMA = 180^o

Example of SAT question with angles:In the figure below, angle AMB is 100^o, angle BMD is 40^o and angle CME is 60^o. What is the value of angle CMD?
Figure not drawn to scale

(a) 20^o
(b) 30^o
(c) 40^o
(d) 50^o
(e) 80^o

Answer: If angle AMB is 100^o, then angle BME is 180^o - 100^o = 80^o
BMC + CMD = 40^o
BMC + CMD + DME = 80^o
If we subtract the 2 equations, DME = 40^o
CMD + DME = 60^o
BMC + CMD + DME = 80^o
If we subtract the 2 equations, BMC = 20^o
CMD = BME - BMC - DME = 80^o - 40^o - 20^o = 20^o

无忧雅思网_雅思预测_雅思机经_雅思考试_雅思资料下载_雅思名师_2018年雅思考试时间

SAT考试几何部分常用公式

Angles Review

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