document.write( "Question 936391: Please help me solve this:\r
\n" ); document.write( "\n" ); document.write( "A quadrilateral has sides 10 cm, 5 cm, 14.14 cm and 15 cm. Find the area if the sum of the opposite angles is 225-degrees. \n" ); document.write( "

Algebra.Com's Answer #569924 by Edwin McCravy(20065) $\"\"$ $\"About$

You can put this solution on YOUR website!

\r\n" );
document.write( "We use Bretschneider's formula:\r\n" );
document.write( "\r\n" );
document.write( "If a, b, c, and d are the sides of a convex quadrilateral, and s is the\r\n" );
document.write( "semiperimeter,  and  and  are two opposite angles, \r\n" );
document.write( "then the area A of the quadrilateral is given by\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "First we calculate s with a=10, b=5, c=14.14, d=15,\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Then using that and ,\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "A = 91.89795801035699017470925314054801987941948129813875441889863... cm².\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( "

\n" );