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Moderate

Properties of Interior Angles 2

GMAT-UPEJZ6

$a$, $b$, $c$, $d$, $e$, and $f$ are formed from three intersecting lines and represent the angle measures in degrees of their respective angles.

Which of the following statements is always TRUE?

A

$d+e=a+f$

B

$180-c=90+b$

C

$e+f$

D

$180+f=360-a-c-e$

E

None of the statements is always true.