3. provide reasons for the proof. given: 2  4 and 2 and 3 are supplementary prove: 1  3 statement reason 1. 2  4 1. given 2. m2 = m4 2. angle congruence postulate 3. 2 and 3 are supplementary 3. given 4. m2 + m3 = 180 4. definition of supplementary angles 5. 1 and 4 are supplementary 5. 6. m1 + m4 = 180 6. definition of supplementary angles 7. m1 + m4 = m2 + m3 7. 8. m1 + m4 = m4 + m3 8. 9. m1 = m3 9. 10. 1  3 10.

54

step-by-step explanation:

6x9

1,918

step-by-step explanation:

step-by-step explanation:

goog be able to you with that maybe

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.