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What is the perimeter, in cm, of quadrilateral $ABCD$ if $\overline{AB} \perp \overline{BC}$, $\overline{DC} \perp \overline{BC}$, $AB=9$ cm, $DC=4$ cm, and $BC=12$ cm?

 Mar 1, 2021
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(9-4)^2+12^2=13^2

 

13+12+9+4=$\boxed{38}$

 Mar 1, 2021

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