Question

If sin Θ = 2 over 7 and tan Θ > 0, what is the value of cos Θ?

Answer 1

we know those side lengths because sinx=o/h
work out the missing side, then work out cosx

except in this case x is theta

Answer 2

would the missing side be 45?

Answer 3

square root it

Answer 4

6.708

Answer 5

\[a^{2}+b^{2}=c^{2} \]
remember pythagoras, gotta square root it

Answer 6

I would leave your answer in surd form
then you can write cosx as a fraction

Answer 7

ok, thank you!!
My choices are
A. 3(sqr root 5)/7
B. -3(sqr root 5)/7
C. 3(sqr root 5)
D. -3(sqr root 5)
It would be A right?

Answer 8

yes well done

Answer 9

Thank you for your help!