The easiest way to work out a percentage is by simple division and then multiplication by 100. 35/56 is 0.625, which then equals 62.5% after mutilplying by 100
It's between 3 and 4 because it is 3.14
To determine to measure of the unknown angle, be sure to use the total sum of 180°. If two angles are given, add them together and then subtract from 180°. If two angles are the same and unknown, subtract the known angle from 180° and then divide by 2.