Find the measure of arc FGH.

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet