Trigonometry Missing angles

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Sin, Cos and Tan

(http://maisarahismail.files.wordpress.com/2012/05/trig_sin_cos_tan.png)

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Missing Angles (Cos)

cos(a) = 7.3/0.8

a = cos   (7.3/9.8)

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Missing Angles (Tan)

tan(c) = 9.4/4.3

c = tan   (9.4/4.3)

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Missing Angles (Sin)

sin(a) = 3/11

a = sin   (3/11)

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Missing Angle Problem

A step ladder can only be safely climbed if the angle of elevation to the ground is 75

How far away from a wall must the ladder be to safely reach 3m above the ground 

  • tan(75) = 3/?
  • ? = 3/tan(75)
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Missing Sides (Sin) 1

sin26 = a/12

(sin26) * 12 = a

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Missing Sides (Sin) 2

sin70 = 32/h

h = 32/sin70

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