Question

not sure how to solve, need quick help!

Answer 1

@peachpi would you be able to explain this one?

Answer 2

cosB = 4/5, which is also equal to a/c. a = 10, so we know that c = 12.5

Answer 3

okay that makes sense. do you use pythagorean theorem for this problem? i just cant remember how to do these

Answer 4

Not directly, in this case, but you might need it for another similar problem. For example, if they gave you sinB, you would need to use the pythagorean theorem to find c.

Answer 5

ohh okay. so then what about this one? we are given B and C

Answer 6

Yes, in this case you would use a^2 + b^2 = c^2 to find a. Then, you find tanA by using the formula tanA = a/b

Answer 7

hmm okay so when you square them does that just cancel the square root?

Answer 8

Yes, pretty much

Answer 9

a^2=7+11--> a^2=18? am i on the right track somewhat hah

Answer 10

Not quite, check your signs

Answer 11

oh my bad. a^2+7=11 then subtract 7 from both sides, a^2=4

Answer 12

then square root 4 and a=2

Answer 13

yup! everything from then on is very straightforward!

Answer 14

ah wait, so now do i just take opp/adj?

Answer 15

yup

Answer 16

hmm wait wouldnt that make it sqrt11/sqrt7? why am i confused haha this should be simple

Answer 17

what do you do with the a that we just solved? does that have to do something?

Answer 18

ohhh, i think im looking at it incorrectly..

Answer 19

is it A? although im not sure how it could be...i think im lost hah

Answer 20

Yes! Remember that 2/root(7) can be rewritten as 2*root(7)/7

Answer 21

ohh yeah to sort of cancel out right?