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+//Centroid of the gusset plate
+//refer fig. 9.15
+//The composite area is divided into algebraic sum and differences of simple geometries
+//for rectangle
+A1=160*280  //mm^2
+x1=140  //mm
+y1=80  //mm
+//for triangle
+A2=280*40/2  //mm^2
+x2=2*280/3  //mm
+y2=160+40/3  //mm
+//1st hole
+A3=(-%pi*21.5^2)/(4)  //mm^2
+x3=70  //mm
+y3=50  //mm
+//second hole
+A4=-363.05  //mm^2
+x4=140  //mm
+y4=50  //mm
+//third hole
+A5=-363.05  //mm^2
+x5=210  //mm
+y5=50  //mm
+//fourth hole
+A6=-363.05  //mm^2
+x6=70  //mm
+y6=120  //mm
+//fifth hole
+A7=-363.05  //mm^2
+x7=140  //mm
+y7=130  //mm
+//sixth hole
+A8=-363.05  //mm^2
+x8=210  //mm
+y8=140  //mm
+A=A1+A2+A3+A4+A5+A6+A7+A8  //mm^2
+sumAixi=A1*x1+A2*x2+A3*x3+A4*x4+A5*x5+A6*x6+A7*x7+A8*x8  //mm^3
+xbar=sumAixi/A  //mm
+sumAiyi=A1*y1+A2*y2+A3*y3+A4*y4+A5*y5+A6*y6+A7*y7+A8*y8
+ybar=sumAiyi/A  //mm
+printf("\xbar=%.3f mm \nybar=%.3f mm",xbar,ybar)
+
+