Made your selections? Lets identify which ones used one of the tricks of the trade.
The Golden Ratio aka The Golden Mean was numerically quantified by the Greeks. If the ratio of width to height is 1:1.618 or the height to width is 1:1.618, the proportions are those of The Golden Ratio / The Golden Mean. Here's how to construct a Golden Rectangle.
This is one of the tricks of the trade. Let's look at the examples again - this time with the Golden Ratio included.
Examples "A" have both vertical and horizontal potential Golden Rectangles., though only A2 actually has both.
Examples "C" demonstrates how a Golden Rectangle can be scaled vertically.
Got you thinking?