ZABD and ZDBC are supplementary angles. What is the measure of x?
x = [?]°
7D
AK
126
x
B
-С
Angles are not drawn to scale.
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x=102°

x+78=180 supplementary angle

x=180-78=102

this is answer of 144 cubic meters

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.