document.write( "Question 595453: Would like to know how to figure the square footage of a triangle 47 by 47 by 18, this is on a constuction site, so do not know the height. Would like to know if there is a formula to use when the height is not known, need to figure out the square feet in the triangle shape. Thank you \n" ); document.write( "
Algebra.Com's Answer #377148 by ankor@dixie-net.com(22740)\"\" \"About 
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This triangle has two equal sides, an isosceles triangle, with a base of 18, can be made up of two right triangles. Find the height using pythag
\n" ); document.write( "h = \"sqrt%2847%5E2-9%5E2%29\"
\n" ); document.write( "h = 46.13
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\n" ); document.write( "Find the area:
\n" ); document.write( "A = .5*b*h
\n" ); document.write( "A = .5*18*46.13
\n" ); document.write( "A ~ 415 sq/units
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