## Qwerty90 3 years ago Ok so I took this EOC and I want to know ho you solve this kind of problem. (Its in a drawing)

1. Qwerty90

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2. amistre64

3. amistre64

it has to do with the arccos of the angle

4. Qwerty90

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

5. amistre64

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

6. Qwerty90

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

7. amistre64

i assume it a rt tri?

8. amistre64

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

9. Qwerty90

its 72 degrees

10. amistre64

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

11. amistre64

12. Qwerty90

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

13. amistre64

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

14. Qwerty90

so what would it be?

15. amistre64

do you know how to use a calculator?

16. amistre64

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