"What is the area? You should be able to solve this"

08082018, 05:03 PM
Post: #21




RE: "What is the area? You should be able to solve this"
On the hp prime I used the geometry app:
Code: "GA:= point(0.,0.); // c(FF000000) v(1) define: a:=(x1,y1,x2,y2,x3,y3,x4,y4)>(ABS(x1*y2+x2*y3+x3*y4+x4*y1x2*y1x3*y2x4*y3x1*y4))/2 // shoelace formula for 4 points xyc  x and y coordinates of point C xn  x coordinate of point N yn  y coordinate of point N initially, {xyc,xn,yn}:={10,3,6} // just a guess use fsolve with 3 equations for areas 1, 2, and 3; and 3 unknowns {xyc,xn,yn}: {xyc,xn,yn}:=fsolve({(a(0,(xyc/2),xn,yn,(xyc/2),xyc,0,xyc)) = 16,(a(0,0,(xyc/2),0,xn,yn,0,(xyc/2))) = 20,(a((xyc/2),0,xyc,0,xyc,(xyc/2),xn,yn)) = 32},{xyc,xn,yn},{10,3,6}) area 4 = 28 road 

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