The Roman numerals of XL stand for 50-10 = 40
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the formula to convert degrees to radiansangle in radians = angle in degrees * Pi / 180 .
Separate XL into two parts (XL) and (VII). Work on them separately, but remember that you must add them again at the end. XL means X many before L, where X is 10 and L is 50. Therefore XL means 10 before 50, or 40. VII means V plus I plus I, where V is 5 and I is 1. Therefore VII means 5 plus 1 plus 1, or 7. So adding the two quantities together, 40 plus 7 is 47. XLVII is 47 in cardinal numbers.