document.write( "Question 791025: How do I show that the area of a triangle can be given by the formula $\"A=%281%2F2%29absinx\"$
\n" ); document.write( "Im not sure how to start, any help will be very appreciated \n" ); document.write( "

Algebra.Com's Answer #479368 by Cromlix(4381) $\"\"$ $\"About$

You can put this solution on YOUR website!
Consider a triangle with the
\n" ); document.write( "points marked as A,B and C
\n" ); document.write( "The sides opposite to the points
\n" ); document.write( "are denoted as a,b and c respectively.
\n" ); document.write( "The formulae you can use are:
\n" ); document.write( "1/2abSinC
\n" ); document.write( "1/2bcSinA
\n" ); document.write( "1/2acSinB
\n" ); document.write( "You are using the size of two sides
\n" ); document.write( "and one angle.
\n" ); document.write( "Example:
\n" ); document.write( "Triangle ABC
\n" ); document.write( "Angle A = 100 degrees
\n" ); document.write( "side c = 6cm
\n" ); document.write( "side b = 5cm
\n" ); document.write( "Using formula:
\n" ); document.write( "1/2 bcSinA
\n" ); document.write( "= 1/2 * 5 * 6 * Sin100
\n" ); document.write( "=1/2 * 5 * 6 * 0.985
\n" ); document.write( "= 14.8cm.
\n" ); document.write( "Hope this helps.
\n" ); document.write( ":-)
\n" ); document.write( " \n" ); document.write( "

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