Notations in Metric Formulas
In the metric formulas below, the following notations are used. A convex quadrilateral ABCD has the sides a = AB, b = BC, c = CD, and d = DA. The diagonals are p = AC and q = BD, and the angle between them is θ. The semiperimeter s is defined as
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Read more about this topic: Quadrilateral
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“That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
—John Dos Passos (1896–1970)