Question

find bc. round to the nearest tenth.
a. 19.1
b. 20.8
c. 23.1
d. 23.3

Answer 1

@jim_thompson5910

Answer 2

@Data_LG2

Answer 3

step 1) Find the missing angle A

step 2) use the law of sines

AB/sin(C) = BC/sin(A)

11/sin(30) = x/sin(A)

x is unknown and you'll solve for it. The value of A will also be known after doing step 1. Make sure you are in degree mode

Answer 4

i need a little more help in this. i dont know much about cos sin and how to specifically solve everything.

Answer 5

do you have a calculator that can handle trig?

Answer 6

no

Answer 7

ok I recommend you use this then

http://web2.0calc.com/

Answer 8

tell me what sin(30) is equal to

Answer 9

0.5

Answer 10

correct

Answer 11

what is the missing angle A equal to?

hint: all three angles of any triangle always add to 180 degrees

Answer 12

60

Answer 13

A+B+C = 180

A+79+30 = 180

A = ???

Answer 14

71

Answer 15

yes

Answer 16

what is sin(71) equal to (use the calculator in the link posted)

Answer 17

0.94

Answer 18

you should get

sin(71) = 0.945518575599

agreed?

Answer 19

yeah

Answer 20

x = length of BC

\[\Large \frac{AB}{\sin(C)} = \frac{BC}{\sin(A)}\]

\[\Large \frac{AB}{\sin(30^{\circ})} = \frac{BC}{\sin(71^{\circ})}\]

\[\Large \frac{11}{0.5} = \frac{x}{0.945518575599}\]

solve for x to get the length of BC

Answer 21

20.68

Answer 22

x = length of BC

\[\Large \frac{AB}{\sin(C)} = \frac{BC}{\sin(A)}\]

\[\Large \frac{AB}{\sin(30^{\circ})} = \frac{BC}{\sin(71^{\circ})}\]

\[\Large \frac{11}{0.5} = \frac{x}{0.945518575599}\]

\[\Large 22 = \frac{x}{0.945518575599}\]

\[\Large 22*0.945518575599 = x\]

\[\Large 20.801408663178 = x\]

\[\Large x = 20.801408663178\]

Answer 23

Use more decimal digits than just 2

so instead of using 0.94 use 0.9455 or 0.945518575599 instead

Answer 24

so the final answer is b???

Answer 25

correct

Answer 26

ty!

Answer 27

np