Question

@arjund12

I can solve to find the angle measure for A and the length of line BC..... all I need help with is finding AB and I can then do the rest.

Answer 1

use the pythagorean thm

Answer 2

a^2 + b^2 = c^2

Answer 3

make the hypo x and us sin and solve for it

Answer 4

sin theta = 30 /x
x =30 sin(20)

Answer 5

which will give you length of AB

Answer 6

therefore, AB = 88 approximentally.

Answer 7

I got 34, trying to find what I did wrong hold on

Answer 8

do you use SOH CAH TOA
to remember which trig function to use ?
in a right triangle, once you know one angle (not including the 90 degree angle) and one side, you can find all sides and all angles.

Answer 9

lostintime if possible show me your work, so i can tell you what you probably did wrong.

Answer 10

you should probably use only trig

Answer 11

dont use pythagorean thm

Answer 12

use sin to find AB length

Answer 13

Ohh okay so can you give me the equation. I'll do the work and then we can see if I do it right this time :]

Answer 14

sin theta = opp/hypo
in our case hypo = x

Answer 15

theta = 20

Answer 16

opp = 30

Answer 17

thus, to find x we do

x = 30/sin(20)

Answer 18

which gives use 88 approximentally.

Answer 19

yes I got it now! :] It's 88 cause you round the 87.7141 to and 88. Thanks soooo much! I can do the rest on my own now.

Answer 20

ok, np.

Answer 21

read my message i sent you.

Answer 22

You do better teaching than my teacher does xD I seriously spents weeks on this and finally I understand how to do this :] Thanks so much again!

Answer 23

*spent

Answer 24

no problem.

Answer 25

btw, if you want a good explanation , see
https://www.khanacademy.org/math/trigonometry/basic-trigonometry/basic_trig_ratios/v/basic-trigonometry
and the following video.

Answer 26

Thanks for the link I'll save it :]