anonymous
  • anonymous
GIVE MEDAL AND BECOME FAN!!! In ∆ABC, BC = 4 centimeters, m B = m C, and m A = 20°. What is AC to two decimal places? 9.32 centimeters 10.01 centimeters 11.52 centimeters 12.09 centimeters
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
OMG love ur hair!!!
misty1212
  • misty1212
|dw:1436969052620:dw|
misty1212
  • misty1212
HI!! thanks !

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misty1212
  • misty1212
does that picture look right?
anonymous
  • anonymous
yes but its confusing
misty1212
  • misty1212
those two bottom angles are equal
anonymous
  • anonymous
ok
anonymous
  • anonymous
im fanning you :)
misty1212
  • misty1212
no that is wrong, each are 80
misty1212
  • misty1212
since \[80+80+20=180\]
misty1212
  • misty1212
you good with that? now it is time for the law of sines
anonymous
  • anonymous
yea i did and im ready >:)
misty1212
  • misty1212
\[\frac{AC}{\sin(80)}=\frac{4}{\sin(20)}\]
misty1212
  • misty1212
so \[AC=\frac{4\sin(80)}{\sin(20)}\]
anonymous
  • anonymous
do i divide tht?
misty1212
  • misty1212
use this http://www.wolframalpha.com/input/?i=4sin%2880%29%2Fsin%2820%29
misty1212
  • misty1212
you need a calculator to do it anyway might as well use wolfram if you scroll down you will see the answer is about \(11.52\)
anonymous
  • anonymous
thx girl :)
misty1212
  • misty1212
\[\huge \color\magenta\heartsuit\]

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