Question

Help with Finding the Area of Oblique Triangles

Answer 1

Find the area of the following triangle. Round your answer to the nearest tenth. c = 210 ft, A = 42.5°, B = 71.4°

Answer 2

180-71.4-42.5=66.1 C=66.1

Answer 3

Now we can use the law of sines to find either a or b

Answer 4

\[\frac{ a }{ \sin42.5 }=\frac{ 210 }{ \sin66.1 }\]

Answer 5

\[a=\frac{ 210\sin42.5 }{ \sin66.1 }\]

Answer 6

why would you use the law of sine?

Answer 7

To get the other side so we can use 1/2ac or bc sinB or A

Answer 8

to get the area

Answer 9

to find the area you only need one side

Answer 10

what you need is the altitude

Answer 11

oh you do need law of sine
two sides are needed for that

Answer 12

oh no it is not gonna be 1/2 ac as you thing
you need the altitude

Answer 13

But thats the way I was taught S:

Answer 14

and a would equal 155.18001622

Answer 15

or 155.2

Answer 16

well that must be a special triangle, with this triangle you can't do that
to find the area altitude is a must

Answer 17

unless you are dealing with right angled trianlge

Answer 18

check your notes and see for yourself

Answer 19

the altitude can be obtained using the side you found
and sin 71.4

Answer 20

It doesn't mention anything about altitude

Answer 21

oh yeah that is also true
but what you did above got me wrong
you wrote 1/2ac
you didn't include sin of the angles btw the the two leges

Answer 22

legs

Answer 23

yeah that seems good to do as well

Answer 24

vectors?

Answer 25

I said that though we could work with 1/2 ac(orbc)sin(A or B)

Answer 26

just misunderstand what you were doing, you are doing good :)

Answer 27

:p Thank you I was confused a lil. So what about this altitude though