Question

a few geometry questions help please?

2. In triangle ABC, < A is a right angle, and mB = 45°. Find BC. If your answer is not an integer, leave it in simplest radical form.

Answer 1

draw it

Answer 2

find angle C
what does that tell you about the triangle?

Answer 3

45, so its an isocleses?

Answer 4

i think thats the word lol

Answer 5

yes

Answer 6

okay do i use cos sin or tan for this question?

Answer 7

isosceles, but the difference is irrelevant.
you don't have to use sin cos or tan.

Answer 8

it's one of your special triangles

Answer 9

wait a second, does BA =12 too?

Answer 10

omgosh guys love the profile pics!

Answer 11

yes

Answer 12

oh okay i got this one then. can you help with two more?

Answer 13

sure

Answer 14

14. Find the value of x. Round to the nearest tenth. The diagram is not drawn to scale.

Answer 15

i thnki have to use cos sin or tan not sure how to set it up though

Answer 16

yupp soh cah toa, so i should use tan?

Answer 17

what side do you know? what side do you want to find?

Answer 18

i know hyp and the angle is wht i will be working with correct? i need to find the adj side

Answer 19

yes
so will sin cos or tan give you what you want from what you have?

Answer 20

i dont think so, but with a little use a division maybe?

Answer 21

one of them will. which one?

Answer 22

cos

Answer 23

yes

Answer 24

so how do i set this up? i know this ones tricky

Answer 25

and you know the length of the hypotenuse

Answer 26

so cos22=x/11

11*22=242 now what?

Answer 27

cos 22 is different from 22

Answer 28

0.9271838545667874 is cos22

Answer 29

yes. so 11*cos(22) is...

Answer 30

10.1990224002346614

Answer 31

yes
so that is the length of the side.

Answer 32

oh okay i understand it now. thank you! i have one more like this but i have to find the angle can you help?

Answer 33

sure

Answer 34

do you know about the arcsin function?

Answer 35

noo i do not i can learn if thats what i need to know to solve

Answer 36

do you know about functions and their inverses?

Answer 37

ive never heard of it unfortanutly

Answer 38

oh fucntions yes inverse not exactly

Answer 39

i kinda have an idea

Answer 40

it's probably on your calculator as

Answer 41

what it's doing is it is finding the angle for a given (opposite/hypotenuse)

Answer 42

so on your calculator you type in

Answer 43

okay i know what you mean i found it on my cal, so i should type it in as sin-1 9/7?

Answer 44

yes
then it gives you the angle.

Answer 45

90 - 42.3414632515504054i

thats what i got...

Answer 46

oh: 7/9 because it's opposite/hypotenuse

Answer 47

sorry

Answer 48

51.0575587310186173
that looks a little better lol, so the angle would be 50 if im rounding to the nearest degree?

Answer 49

51 if you're rounding to the nearest degree

Answer 50

thats whati meant lol, well thank you sooo much! i learned alot tonight!

Answer 51

you're welcome.