21 and 27 are...
3
a linear pair
vertical angles
2
-a
8
consecutive exterior angles
consecutive interior angles
alternate interior angles
alternate exterior angles
corresponding angles
rod.instructure.com/taking/332113/take#
5
7
6
b
XC

21 and 27 are 3 a linear pair vertical angles 2 a 8 consecutive exterior angles consecutive interior angles alternate interior angles alternate exterior angles class=