length times width
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Length times width.
The rule for S.A = 2bh + 2bw + 2hw
2(b+h)
You find the perimeter of a triangle by adding all the sides. There is no special rule for finding the perimeter.
The empirical rule is 68 - 95 - 99.7. 68% is the area for +/- 1 standard deviation (SD) from the mean, 95% is the area for +/- 2 SD from the mean; and 99.7% is the area for +/- 3 SD from the mean.