Question

In triangle ABC, angle A is a right angle, and angle B= 45 degrees. what is the length of BC?

Answer 1

Use trig, since you know that b is 45 degrees, use Sin

Answer 2

Sin is Opposite over Hypotenuse

Answer 3

how do I do that? sorry... I never understood that.

Answer 4

\[Sin 45 = 13/x\]

Answer 5

that gave me .85

Answer 6

Remember that the sin function has a denominator of 1, even though you don't see it, set it up and cross multiply

Answer 7

13/sin45

Answer 8

Solve for that

Answer 9

ok

Answer 10

.28?

Answer 11

13 divided by sin45, use your calculator. sin45 = .8509, so 13 divided by .8509 will give you your ans

Answer 12

ohh! yeah, I was like what the heck are they talking about? yeah I'm familiar with this

Answer 13

Alright, glad you got it! :P

Answer 14

1.17 is what I got...

Answer 15

Um, not quite...

Answer 16

go on google and type in calculator if you need it.

Answer 17

13 divided by .8509?

Answer 18

I'm using my phone.. I guess it's messed up

Answer 19

You know it's not 1.17 because .85 goes into 13 way more then 1 time

Answer 20

yeah... haha

Answer 21

15.29?

Answer 22

Yes :), but if you want it to be precise, divide 13 by sin45, using ur calc. but yes, you are right =)

Answer 23

it says to leave it in simplest radical form, how do I do that?

Answer 24

@Schen421 ^

Answer 25

Well, I see that this is a 45 45 90 triangle

Answer 26

That means 2 of the sides are the same and the hypotenuse is sqrt(2)

Answer 27

so then it would be 13√2

Answer 28

Actually, hold on, lemme recheck my work.

Answer 29

Oh... oops my bad.

Answer 30

I had my calculator set to radians, make sure the calc is set on degrees, so do 13 divided by sin 45 and you should get 18.384

Answer 31

and then yes, that is equal to 13sqrt(2)

Answer 32

yeah that makes a lot more sense... haha! but thank you so much! you were so helpful!!

Answer 33

My bad for that, thought I had set it to degrees already haha =P

Answer 34

\[13\sqrt{2}\] shall be the ans =p (in radical form)

Answer 35

:-)