kylalazatin kylalazatin
  • 03-07-2017
  • Mathematics
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this question is from the tangent ratio section in our chapter and im not sure how to solve for this

this question is from the tangent ratio section in our chapter and im not sure how to solve for this class=

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mreijepatmat
mreijepatmat mreijepatmat
  • 03-07-2017
The large triangle is an isosceles since both angles at the base each equal 42°.
In an isosceles triangle the altitude z is at the same time median , then it bisects the opposite side in the middle . So w = 120/2 = 60

Now let's calculate z:
 tan 42° = (opposite side) / (adjacent side) = z/60
tan 42° = 0.9,
0.9 = z/60 and z = 54
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