A goldsmith designed a trapezoidal pendant as shown in the figure. If the perpendicular distance between AB and CD is 9 centimeters and area of the pendant ABCD is 45 square centimeters, find the length of the side CD.

answer is

c) 4

step-by-step explanation:

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step-by-step explanation:

sdfghjkl; vbnm,

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.

i think it would be c

mark brainliest if im right

step-by-step explanation: