POLYAREA

a = POLYAREA (poly)

Returns the area of the polyline poly. The algebraic sign of the area is positive for counterclockwise ordering of vertices in x-y plane; otherwise negative.

See DRAWPOLY for more information on how to define the polyline.

Example

polygon = [ [50,50], [100,50], [100,100], [50,100], [50,50]]
drawpoly polygon color 12

Area = abs(polyarea(polygon))     ' absolute value of the area, because
                                  ' we are not interested in the
                                  ' ordering of the vertices.

print "Polyarea() returns: "; Area
print "Exact area is 50x50 = 2500"

ABS ABSMAX ABSMIN ACOS ACOSH ACOT ACOTH ACSC ACSCH ASEC ASECH ASIN ASINH ATAN ATAN2 ATANH ATN CEIL COS COSH COT COTH CSC CSCH DEG DERIV DETERM DIFFEQN EXP EXPRSEQ FIX FLOOR FRAC INT INTERSECT INVERSE LINEQN LOG LOG10 M3APPLY M3IDENT M3ROTATE M3SCALE M3TRANS MAX MIN POLYAREA POLYCENT POLYEXT POW PTDISTLN PTDISTSEG PTSIGN RAD RND ROOT ROUND SEC SECH SEGCOS SEGLEN SEGSIN SEQ SGN SIN SINH SQR STATMEAN STATMEANDEV STATMEDIAN STATSPREADP STATSPREADS STATSTD SUM SUMSQ TAN TANH TRANSPOSE