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julsineya [31]
3 years ago
7

I'm not sure at all how to do this​

Mathematics
1 answer:
Greeley [361]3 years ago
6 0

Answer:

Step-by-step 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}

\sqrt{21} = x

Cos(Ф) = \sqrt{21} / 5      

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

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