56÷7=8 that is the answer have a nice day
Instead of adding or subtracting 2pi (that's for radians only), just add or subtract 360 degrees to your angle.
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You need to find the common primes...
18=2*3*3 and 72=2*2*2*3*3 so they have 2*3*3 in common and
2*3*3=18
So 18 is the greatest common factor.