In general, that is pretty nearly impossible.
It is possible if the shapes are made up of straight line segments. Then, if you join up each pair of corresponding points in the two objects and extend those lines, they must all meet in a single point. However, this method breaks down as soon as you have any curves in the objects since finding corresponding points becomes near impossible.
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You can use a plot diagram to plot the points and if they all go straight through the origin then it is proportional
Graphical: If two variables are proportional, the graph of one of the variables against the other is a straight line through the origin.Algebraic: If the ratio of the two variables is a constant.
A straight line through the origin, and with a positive gradient (sloping from bottom left to top right).
Graphing proportions is to take two ratios and plot them on an (x,y) coordinate plane. You need to be consistent with your labeling. If you use the numerator of one ratio as your x coordinate, then the numerator of the other ratio must be the 2nd x coordinate. You can graph as many of these points as are given. If your ratio's are proportional then you will have a straight line. If it is not a straight line when graphed your ratios are not proportional.
Because the two variables cannot be zero voltage = current*resistance if we draw graph current against resistance we would see a exponential graph which means the two variables are inversely proportional but either cannot be zero because voltage is not equal to 0 n.j.p