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

 May 12, 2021
 #1
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If you draw it out , you will find   AD = 13  cm              13 + 12 + 4 + 9 = 38 cm

 May 12, 2021
edited by ElectricPavlov  May 12, 2021
edited by ElectricPavlov  May 12, 2021
 #2
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AD = sqrt  [ ( 5 - 0)^2  + (12 - 0)^2 ] =  sqrt [ 25 + 144]   =sqrt (169)   = 13

 

 

So  the perimeter =   9  + 12  + 4 + 13   =   38 units 

 May 13, 2021

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