document.write( "Question 933855: Hi,
\n" ); document.write( "I am Arun. I have problem in solving triangles. In a triangle ABC, AC is 10, BC is 0.025 and AB is 9.978. And the angle between BCA is said to be 30 degree. I need to find the other two angles. I have used the cosine law of triangles and many other methods. For each method, i am getting a different solution for these two angles CAB and CBA. Can you help me in solving this?.\r
\n" ); document.write( "\n" ); document.write( "Thank you. Waiting for your response.
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Algebra.Com's Answer #567099 by MathLover1(20849)\"\" \"About 
You can put this solution on YOUR website!
check your side \"a\"; with given \"a=0.025\" is impossible to get real solution for angle \"A\" using law of cos:\r
\n" ); document.write( "\n" ); document.write( "\"a%5E2=c%5E2%2Bb%5E2-2bc%2Acos%28A%29\"\r
\n" ); document.write( "\n" ); document.write( "\"%280.025%29%5E2=10%5E2%2B%289.978%29%5E2-%2810%29%289.978%29%2Acos%28A%29\"\r
\n" ); document.write( "\n" ); document.write( "\"0.000625=100%2B99.560484-99.78%2Acos%28A%29\"\r
\n" ); document.write( "\n" ); document.write( "\"0.000625=199.560484-99.78%2Acos%28A%29\"\r
\n" ); document.write( "\n" ); document.write( "\"99.78%2Acos%28A%29=199.560484-0.000625\"\r
\n" ); document.write( "\n" ); document.write( "\"99.78%2Acos%28A%29=199.559859\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28A%29=199.559859%2F99.78\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28A%29=1.9999986\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"A=1.3169571%2Ai\"(result in radians)\r
\n" ); document.write( "\n" ); document.write( "\"A=75.46%2Ai\" ° or \"A=0.0716197\"° which is very small angle\r
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\n" ); document.write( "\n" ); document.write( "I was trying to find angle \"B\" using side \"b=9.978\", side \"c=10\", and angle \"C=30\" using law of sin and got these results:\r
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\n" ); document.write( "\n" ); document.write( "\"a+=+17.3+\" you can get angle \"C+=+30\"°
\n" ); document.write( "\"b+=+9.98\"
\n" ); document.write( "\"c+=+10\"\r
\n" ); document.write( "\n" ); document.write( "Angles:
\n" ); document.write( "\"A+=+120\"°
\n" ); document.write( "\"B+=+29.9\"°
\n" ); document.write( "\"C+=+30\"° \r
\n" ); document.write( "\n" ); document.write( "so, IF given angle is \"30\", then \"a+=+17.3+\"\r
\n" ); document.write( "\n" ); document.write( "or, if you trying to find angle \"A\" using side \"a=0.025\", side \"c=10\", and angle \"C=30%7D%7D%2C+then+side+%7B%7B%7Bb\" must be \"10.0216\"\r
\n" ); document.write( "\n" ); document.write( "results are as following:
\n" ); document.write( "Sides:
\n" ); document.write( "\"a+=+0.025+\"
\n" ); document.write( "\"b+=+10.0216+\"
\n" ); document.write( "\"c+=+10+\"\r
\n" ); document.write( "\n" ); document.write( "Angles:
\n" ); document.write( "\"A+=+0.0716197\"°......I wouldn't prefer this solution because the angle is very, very small
\n" ); document.write( "\"B+=+149.928\"°
\n" ); document.write( "\"C+=+30\"° \r
\n" ); document.write( "\n" ); document.write( "when you got right sides length, would be possible to find real solutions for angles \r
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