AB // CD, find the values of the unknowns
g = 19
AOB and COD are straight lines, find the values of the unknowns
c = 112, d = 29
AB // CD, find the values of the unknowns
d = 29
find the values of the unknowns
b = 36
AOB, COD, and EOF are straight lines, find the values of the unknowns
a = 23
AB // CD, find the values of the unknowns
b = 23, c = 39
AB // CD, find the values of the unknowns
a = 124
AB // CD, find the values of the unknowns
f = 65