Question

Trig help The following information refers to triangle ABC. Find angle B
A = 42° 30', C = 120° 30', a = 4.53 ft

Answer 1

What does the 30' part mean?

Answer 2

check your trig sheet for the "law of sines"

Answer 3

ohh, the 30' means 'minutes', there are 60minutes to a degree, and 60'' seconds to a minute, 30minutes off a total of 60 is 0.5 degree

Answer 4

so, \(42^o30'\) can also be written as \(41^o89'60''\) :)

Answer 5

Thanks man! But what do I do with the minutes

Answer 6

When finding the angle

Answer 7

make them decimals :), to work with the Law of Sines

Answer 8

30' off a total of 60 is 0.5

Answer 9

Like half of 42 ? or 42.5 degrees?

Answer 10

how many degrees do all internal angles in a triangle sum up to?

Answer 11

180

Answer 12

it says 18 isn't the angle though

Answer 13

right, you have \(\angle A\ and\ \angle C\), so A+B+C=180, so B=180-(A+C) :)

Answer 14

tis a tiny angle by the way

Answer 15

yeah I got 18

Answer 16

But it wasnt right

Answer 17

well, \(42^o30'+120^o30'\) is not the same as \(42^o+120^o\)

Answer 18

come to think, you don't even need the law of sines :|, since all you're after is \(\angle B\)

Answer 19

If it isnt the same what is it then

Answer 20

what would you get from \(42^o30'\) making the 30' a decimal?

Answer 21

42.5

Answer 22

yeah, so B=180-(42.5+120.5)

Answer 23

Thanks I got it! :_)

Answer 24

:o)

Answer 25

yw