Question

Help please!! Just four questions!

Answer 1

so in this example you have the adjacent side (7) and want the hypotenuse, remember which trig ratio this is?

Answer 2

no i dont remember exatly but i do remember doing this before

Answer 3

exactly*

Answer 4

no prob

so we would use cos here

cos(theta) = adjacent/hypotenuse

plug in the theta, adjacent, and solve for hypotenuse

Answer 5

what's the theta?

Answer 6

is that the angle?

Answer 7

yes

Answer 8

okay

Answer 9

cos(20)=7/x ?

Answer 10

awesome then solve for x

Answer 11

17.1534

Answer 12

hm. is your calculator in radians instead of degrees? I get 7.45

Answer 13

im not sure

Answer 14

well anyway if you're having trouble with your calculator you can try wolframalpha.com

when I plug in cos(20)=7/x ? I get 7.45 as the solution

Answer 15

i've used wolframalpha before and it's pretty Saucety

Answer 16

just double checked with my ti-84 and I also get 7.45

you only get 17.154 in radians mode

Answer 17

okay

Answer 18

can you help me with another one please?

Answer 19

sure

Answer 20

thank you

Answer 21

this time we have the adjacent side and want the opposite side

so tan(theta) = opposite/adjacent, solve for opposite

Answer 22

okay

Answer 23

tan(40)=x/6 ?

Answer 24

yup, solve for x, make sure its in degrees

Answer 25

okay

Answer 26

5.0346?

Answer 27

good but they only want to the nearest hundreth so 5.03

Answer 28

okay, thanks. next one?

Answer 29

ok

Answer 30

we have hypotenuse and want the opposite so let's use sin

sin(theta) = opposite/hypotenuse

solve for opposite

Answer 31

k easy peasy

Answer 32

4.4995

Answer 33

good, this would round up to 4.50

Answer 34

awesome

Answer 35

opposite and adjacent so tan again

tan(theta) = opposite/adjacent

solve for adjacent

Answer 36

tan(70)=x/6 ?

Answer 37

the opposite side is 6 so 6/x not x/6

Answer 38

okay, i wasn't sure

Answer 39

2.1838

Answer 40

good, so round down to 2.18

Answer 41

awesome, thanks so much for your help