Complete the following item. Consult the table above to find the cosine number. Find A to the nearest degree. A ??? degrees.

1 answer:

6 0

3) This one is a little different, since you're finding the angle instead of the side. You can denote the angle to be the variable x. Thus:
cos x = 14 / 26
Use a calculator to divide out 14/26, then round to four decimals.
cos x = 0.5385
Now go to the cosine chart and find which angle has the cosine 0.5385. It's a strange problem they gave you, because the chart doesn't have a value that matches it (kind of confusing if you ask me). But you can find two angles it is between. Notice that cos 57° = 0.5446 and cos 58° = 0.5299. Thus, the angle must be between those two. It turns out it is closer to 57°, so you can say:
x = 57°

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The area of each triangular face is
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.. Aside = (1/2)*(6 cm)*(5 cm) = 15 cm^2

The area of the triangular base is
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