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Multiply the length of the side by the length of the top or bottom.
usually in a quadrilateral (four-sided shape) you multiply the height by width In a triangle, the height by width then divide by 2. This is because a triangle is mathematically always half the area of the rectangle. In a trapezium or trapezoid in some countries, its the top length added to the bottom length which is then divided by two multiplied by the length top to bottom. But always remember the height you multiply it with is the straight top to bottom length not the side length.
The trough is the bottom and the crest is the top. The whole vertical length of the crest, trough, and crest are called a wavelength. See related link for a diagram.
length and height is the same thing it is the height from the bottom to the top of the figure and width is the measurement across and object
The depth is neither the length nor width. Length is the measurement from top to bottom, width is from side to side, and depth is from front to back.