Question

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Triangle ABC has three sides with these lengths: AB = 9, BC = 40, and CA = 41. What is the value of cos C?

A. 9/41

B. 40/9

C. 40/41

D. 9/40

Answer 1

got a picture?

Answer 2

no..

Answer 3

k lets draw one

Answer 4

Alright. I tried but im not sure if i even drew it right..

Answer 5

how's that look?

Answer 6

can you find the cosine of C now, with the picture?

Answer 7

Cos = adjacent/hypotenuse sooo C= 9/40?

Answer 8

or c= 41/40?

Answer 9

hmm neither
which side is "adjacent' to the angle i drew?

Answer 10

Ughh.. uhhh... idk.. :/

Answer 11

well lets take a look

Answer 12

the hypotenuse is the longest side, the one opposite the right angle
the "opposite" side is the side that is, well, opposite the angle
the adjacent side is the side next to it

Answer 13

adjacent means "beside" :)

so the side beside the angle

Answer 14

wait.. soo.. does Cos = adjacent/hypotenuse?

Answer 15

yes, that you need to memorize

Answer 16

sooo..... C= 41/40 ? right?

Answer 17

the hypotenuse is ALWAYS the longest side :-)

Answer 18

Okay (: Soo.. ^^ My last comment. That was right, right?

Answer 19

but thats not a answer choice..

Answer 20

C.

Answer 21

thats 40/41 tho..

Answer 22

they're the same thing?

Answer 23

what are the same thing?