90 degrees is a right angle
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Absolute value of 90 is 90.
at -90 degrees the value of cos(x) is 0.
Why an approximate value when you know the exact value is 90! To the nearest thousand, for example, it is 0.
3.7 x 90 = 333
In the Roman numeric system, symbols are given value. When a smaller value symbol proceeds a higher value symbol, then the smaller value symbol is subtracted from the high value symbol. In this case XC is equal to 90 (X =10, C = 100. So XC equals 100 - 10 or 90). The symbols that hold numeric are I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000.