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SAT考試幾何部分常用公式

時(shí)間:2021-06-23 10:46:50 Sat 我要投稿

精選SAT考試幾何部分常用公式

  Angles Review

精選SAT考試幾何部分常用公式

  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.

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