Question

In ∆ABC, what is the value of cos B?
a) 5/4
b) 3/4
c) 3/5
d) 4/5
e) 4/3

Answer 1

do you know what ratio the cosine function represents?

Answer 2

I forgot what it was... tbh.... I'm really horrible at math... and i couldn't catch on to it...

Answer 3

Don't worry :) I can help you. Have you heard of SOH CAH TOA before?

Answer 4

no i havent, my teacher never taught me that

Answer 5

It essentially means \[\sin=O/H, \cos=A/H, \tan=O/A\]

Answer 6

it's a mnemonic worth remembering for trigonometry.

Answer 7

oohhh

Answer 8

so if cos = adjacent/hypotenuse, do you know which to sides these are in relation to angle b?

Answer 9

adjacent and hypotenuse?

Answer 10

@Sepeario

Answer 11

yes but which sides are they in the above triangle?

Answer 12

3 and 5??

Answer 13

right?

Answer 14

@Sepeario

Answer 15

yep, so the final ratio is?

Answer 16

wait how would i put that in my calculator?

Answer 17

i'm so sorry i literally forget so much stuff it's a problem....

Answer 18

@Sepeario

Answer 19

you can't really put that into a calculator. so what is the final answer?

Answer 20

if adjacent = 3 and hypotenuse = 5 and cos 60 = a/h = ?

Answer 21

frig..... um....

Answer 22

it's 3/5??

Answer 23

sorry i'm so tired and i have 6 online geometry tests to do by 1:18 p.m and its 8:21 a.m

Answer 24

so is it 3/5 @Sepeario

Answer 25

yep that's right

Answer 26

good luck! and i'm sure you'll do well.

Answer 27

i suck at math

Answer 28

i'm gonna fail and have to repeat freshman year