Stan knows that segment ab || segment cd. he wants to use the definition of a
parallelogram to prove that quadrilateral abcd is a parallelogram. which equation
can he use?

it’s the first one your welcome

6x = 48

i hope this . 6 cards each and a total of $48. dvide each side by 6 and you will have your answer.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

answer. d.289 hope that