document.write( "Question 1105524: Prove that sum of the three angles of a triangle is 1800
\n" ); document.write( ".Using the result, find the value of x and all the
\n" ); document.write( "three angles of a triangle, if the angles are (2x – 7)0
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Algebra.Com's Answer #720368 by ikleyn(52873)\"\" \"About 
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document.write( "Regarding the proof, see the lesson\r\n" );
document.write( "    - Sum of the interior angles of a triangle\r\n" );
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document.write( "Then\r\n" );
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document.write( "(2x-7) + (x+25) + (3x+12) = 180\r\n" );
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document.write( "6x + 30 = 180\r\n" );
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document.write( "6x = 180-30 = 150  ====>  x = \"150%2F6\" = 25 degrees.\r\n" );
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document.write( "Having this, find the angles on your own.\r\n" );
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