17. Construction: Carlos is planning to build a grain bin with a radius of 15 ft. He reads that the recommended slant of the roof is 25 degrees. He wants the roof to overhang the edge of the bin by 1 ft. What should the length x be? Give your answer in feet and inches. Show work and explain answer to get medal for patronage! :D

Question

firejay5 · Answer

Question 17: http://khsmath.weebly.com/uploads/5/3/6/7/5367131/sine_and_cosine_ratios_8-4.pdf

firejay5 · Answer

@satellite73

anonymous · Answer

just make a triangle out of it from the center of the circle to the outside. |dw:1393388745919:dw|

you know the length of the base leg of the right triangle and the angle it makes.

$$\cos \theta=adjacent/hypotenuse $$
$$hypotenuse = \frac{ adjacent }{ \cos \theta } = 16/\cos20$$

firejay5 · Answer

Wait why is it tangent instead of cosine or sine????

anonymous · Answer

you are looking for the hypotenuse actually so you would want to use cosine.

firejay5 · Answer

@nikato why did you take that off

nikato · Answer

oh, i did it wrong, its actually cos.
you know the adjacent and hypothenuse so CAH
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