or x4 +x2 +=0
% area of ▮ / maximum area of ▮
Put value of one side
Value of other side
Area of Rectangle-
area of Circle
Radius of Circle
Revised Perimeter
Area of Ellipse
% area of ellipse / maximum area of ellipse
*To find side c of a triangle when a,b are given and in between angle say θ is given . area=(ab/2)sinθ .Now area formula from the sides is (X1+c)(X2+c)(-X2+c)(X1-c) =16 A*A where X1=a+b,X2=b-a; simplifying, c4 -(X12 +X22)c2 +[(X12 *X22 )+16A*A]=0 or c*c=y and y2 -(X12 +X22)y +[(X12 *X22 )+16A*A]=0 or Ay2 +By+C=0 where A=1, B = -(X12 +X22) =-2(a*a+b*b) and C=[(X12 *X22 )+16A*A] = (a+b)2*(b-a)2 +16A*A;
* in ellipse, R=(peri-R)*dfactor or R=peri*dfactor/(1+dfactor)