Question

ABCD is a parallelogram. If m 10 years ago

Answer 1

Rule: adjacent angles of any parallelogram are supplementary. That means they add to 180 degrees

Answer 2

So C+D = 180

Answer 3

Now let's say C = 90 degrees. That would make D = 90 degrees.

If D were to increase to something like D = 120, then what happens to C?

Answer 4

c would decrease?

Answer 5

yes C would go from C = 90 to C = 60

Answer 6

before: C = 90, D = 90 .... C+D = 90+90 = 180

after: D = 120, C = 60 ... C+D = 60+120 = 180

Answer 7

oooh thank you that makes more sense! I was not sure if they were supplementary at first

Answer 8

no problem