+0  
 
+1
188
4
avatar+1441 

Could there be another answer to this? I'm told 62.35 and 62 7/20 are wrong.

 

https://web2.0calc.com/questions/find-the-area-of-triangle-abc-if-ab-bc-12-and-angle#r3

 

Thanks!

AnonymousConfusedGuy  Feb 14, 2018
 #1
avatar+549 
+2

does it say to any particular decimal place or significant figure?

 

 

winkwinkwink

lynx7  Feb 14, 2018
 #2
avatar+549 
+2

in surds form= 36√3cm²

 

winkwinkwink

lynx7  Feb 14, 2018
 #3
avatar+93038 
+1

Find the area of triangle ABC if AB = BC = 12 and angle ABC = 120 degrees.

 

                          B          

        12           120         12

A                                                C

 

 

Area  =   (1/2) (12) (12)sin (120)  =

 

72 * sin (120)  =

 

72  * √3  / 2  =

 

36 √3   units ^2   ≈   62.35 units^2

 

Maybe they want the  exact value  [ first answer ]. ACG

 

 

cool cool cool

CPhill  Feb 14, 2018
 #4
avatar+1441 
+2

36sqrt3 was right! Thanks you guys!

AnonymousConfusedGuy  Feb 14, 2018

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