Answer:
45°
Step-by-step explanation:
360° is 100% (or 1, the whole)
so the ratio to use is 360:100 = x : 12.5
the proportionality between 360 and 100 must be the same as between the unknown value x and 12.5 (this is more or less the meaning in words), which leads to
x = (12.5*360)/100 = 45°
Another way of seeing it: 12.5% is 1/8 of 100% (therefore 1/8 of 360) so 360/8 = 45°
