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bearhunter [10]
3 years ago
7

How many degrees does she rotate the telescope to see star b?

Mathematics
1 answer:
Lana71 [14]3 years ago
4 0

We have to use the law of cosines to solve for the missing angle.

cos(?) = (400^2 + 450^2 - 90^2) / (2*400*450).

Since, we want the exact value, we are going to take the inverse cosine of both sides

? = 10 degrees

The astronomer had to rotate her telescope 10 degrees to see star B

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