Hai,

i have 3 points on a plane, whose positions are fixed. and

one arbitrary point, it's position can vary.

i have to form a quadrilateral by making use of these 4

points , it may form concave or convex quadrilateral.

from this data one point is clear that 2 sides and 1

diagonal length are fixed. and i want to calculate the

length of another diagonal.

how do i do it??

thanks !!

Ashwini