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C, D are points defined by position vectors c and d. Magnitude of c is 5, mag of d is 7, c dotproduct d is 4 ie c.d = 4, find the magnitude of vector CD.

So i started this way

c.d = magc*magdcos@

= 35cos@, @ = 83.4 degrees

But still no idea how do get magnitude of vector cd. Thank you!

So i started this way

c.d = magc*magdcos@

= 35cos@, @ = 83.4 degrees

But still no idea how do get magnitude of vector cd. Thank you!

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