document.write( "Question 882802: Find the angles in the triangle when a = 13, b = 12, and c = 11. Round your answers to the nearest tenth. Im not sure how to find angles our of the sides or what ever this is implying im so lostt. \n" ); document.write( "

Algebra.Com's Answer #533103 by Alan3354(69443) $\"\"$ $\"About$

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Find the angles in the triangle when a = 13, b = 12, and c = 11. Round your answers to the nearest tenth.
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\n" ); document.write( "Use the Cosine Law
\n" ); document.write( " $\"c%5E2+=+a%5E2+%2B+b%5E2+-+2ab%2Acos%28C%29\"$ Angle C is opposite side c
\n" ); document.write( " $\"11%5E2+=+13%5E2+%2B+12%5E2+-+2%2A13%2A12%2Acos%28C%29\"$
\n" ); document.write( "cos(C) = 192/312 = 8/13
\n" ); document.write( "C =~ 52.02 degs
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\n" ); document.write( "You can get another angle the same way, or use the Law of Sines
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\n" ); document.write( "c/cos(C) = b/cos(B) = a/cos(A)
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\n" ); document.write( "After you find a 2nd angle, the 3rd is 180 - sum of the other 2.
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