How can you justify that ∠ABE ≅ ∠CDE? Explain. AB and (DC, BC, AD) are parallel, so ∠ABE and ∠CDE form (Alternate interior angles, alternate exterior angles, verticle angles.

So the angles are congruent by the (Alternate Exterior Angles Theorem, alternate interior angle theorem, or verticle angle theorem).

answer: 414,377,008

step-by-step explanation:

just multiply it

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.