kind of hard to explain over the internet but I'll try my best. one circle (ie one full clock, one full 60 minutes) is 360 degrees, or 2pi radians, so 42/60 = x/360 or x/2pi if you want it in radians. multiply both sides by 360, or 2pi, again if you want it in radians. the answer is 252 degrees or 1.4pi radians.
42/60 = x/360
(42X360)/60 = x
x= 252
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It is 5/4 of 90 degrees = 112.5 degrees
Total angles is 180 x 5 - 360o ie 540o. If the pentagon is regular (all sides equal) then each angle is 108o. If it is not regular then you need the measurement of 4 of the angles.
Degrees are units of angle measurement, while metres are units of length. The two units are therefore incompatible.
2/7 = 12/42 5/6 = 35/42 12/42 + 35/42 = 47/42 or 1 and 5/42
5/6 of 42 is 35.