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I'm not sure at all how to do this


I'm not sure at all how to do this ​-example-1

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Answer:

Explanation:

Cos(Ф) = Adj / Hyp

Cos(Ф) = Adj / 5

use Pythagoras's


5^(2) =
2^(2) +
x^(2)

25 - 4 =
x^(2)

21 =
x^(2)


√(21) = x

Cos(Ф) =
√(21) / 5

(using the square root means the answer is exact. so leave it like that.)

I'm not sure at all how to do this ​-example-1
User Jed Grant
by
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