Question

Use the law of cosines to determine the length x in each figure when a = 4 cm and b = 18 cm. Leave your answers in terms of radicals.

a) x= ?

b) x= ?

Answer 1

A)

Answer 2

B)

Answer 3

I keep getting 340-72 √3, but how can I simplify it?

Answer 4

probably can't

Answer 5

not sure it is right though

Answer 6

\[x^2=4^2+18^2-2\times 4\times 18\times \frac{\sqrt3}{2}\]

Answer 7

but that is \(x^2\)
\(x\) is the square root of that number

Answer 8

So I did it incorrectly?

Answer 9

I tried answer your question, but..... Please follow here: