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Geometry Per
Because Figure X is a square and the diagonals of a square are the same length, are perpendicular, and bisect each other, it follows that each triangular piece is a 45°−45°−90° triangle. Thus, the length of each side of the square is a, and the perimeter is 4a. The perimeter of the rectangle is 2(a + 2a) = 6a. It follows that the ratio of the perimeter of the square to the perimeter of the rectangle is
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- 【OG18-P680-668题】In a review of 2,000 studies of human behavior that date back to the 1940s, two Swiss psychologists, declaring that since most of the studies had failed to control for such variables as social class and family size, none could be taken seriously.
- 【OG18-P680-671题】Manufacturers rate batteries in watt-hours; if they rate the watt-hour higher, the longer the battery can be expected to last.
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