Qwerty90
Ok so I took this EOC and I want to know ho you solve this kind of problem. (Its in a drawing)



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Qwerty90
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dw:1335470334534:dw

amistre64
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i cant read the scribble

amistre64
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it has to do with the arccos of the angle

Qwerty90
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The side length is 176 and the degrees is 72 inside the triangle

amistre64
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then cos(72) = s/176
176 cos(72) = s
you justs got to remember your definitions on your trigs

Qwerty90
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The question is what is the missing side length based on that information

amistre64
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i assume it a rt tri?

amistre64
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make sure your calc is on degrees and not radians; or simply substitute 72 with, 72pi/180

Qwerty90
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its 72 degrees

amistre64
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yes, but calculators can be set to read degrees or radians; 72 degress is NOT 72 radians

amistre64
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72 degress = 72pi/180 radians

Qwerty90
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Ok then that.. how would you solve it? Cause im like they only gave me the angle degrees and a side length and are asking for the other side length

amistre64
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the point being:
the side length is determined by the cosine function
cos = side/hypot
cos(72) = s/176 ; multiply both sides by 176
176 cos(72) = s

Qwerty90
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so what would it be?

amistre64
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do you know how to use a calculator?

amistre64
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if not, the wolf will give an approximate value; otherwise, that is the exact value