Match the sets of points representing one-to-one functions with the sets of points representing their inverse functions. Tiles
h = {(1,1), (2,2), (3,3), (4,4), (5,5), (6,6)}

g = {(1,3), (2,6), (3,9), (4,12), (5,15), (6,18)}

f = {(1,2), (2,3), (3,4), (4,5), (5,6), (6,7)}

i = {(1,1), (2,3), (3,5), (4,7), (5,9), (6,11)}

Pairs
h-1 = {(1,1), (2,2), (3,3), (4,4), (5,5), (6,6)}

i -1 = {(1,1), (3,2), (5,3), (7,4), (9,5), (11,6)}

g-1 = {(3,1), (6,2), (9,3), (12,4), (15,5), (18,6)}

f -1 = {(2,1), (3,2), (4,3), (5,4), (6,5), (7,6)}

x = central angle apc = measure of minor arc ac

the two angles x and 30 add to 180, so x+30 = 180 and x = 180-30 = 150. the measure of minor arc ac is 150 degrees.

what we need to do from here is find the circumference and then multiply it by x/360 since there are 360 degrees in a circle. in this case, x = 150, so x/360 = 150/360 = 15/36 = 5/12. the shortest distance along the curve from a to c is 5/12 of the distance around the entire circle (aka circumference)

c = circumference

c = pi*d

c = pi*24

c = 24pi

now multiply this by 5/12 to get

distance along minor arc ac = (5/12)*(circumference)

distance along minor arc ac = (5/12)*(24pi)

distance along minor arc ac = 10pi

the formula you can use is

l = (x/360)*pi*d

with

l = length of minor arc

x = central angle

d = diameter

which essentially is the steps we took though a bit differently.

goog may have it for you