Question

What is the length of side AB if AC is 5 sqrt 2?

Answer 1

a. 5m
b. 5 sqrt 2 m
c. 5 sqrt 3 m
d. 10m

Answer 2

use cosine

Answer 3

you should use cos which is equal =adjacent over hyp \[\huge\rm cos 45 = \frac{ x }{ 5\sqrt{2} }\]
http://openstudy.com/study#/updates/5575da3ce4b0826b0eaf6c46

Answer 4

what is cos(45)=?

Answer 5

i think its c but my math is off

Answer 6

nope c is wrong and remember
it's 45 degree*

Answer 7

\[2 x^2=\left(5 \sqrt{2}\right)^2 \]
x = 5

Answer 8

you can use pythagoras's theorem
\[x^2+x^2=\left( 5\sqrt{2} \right)^2,x=?\]

Answer 9

thank you all i think i got it :)