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In triangle ABC, side AB is 9" and side BC is 5" . How large is AC if the perimeter is 21" ?

 Nov 12, 2018
 #1
avatar+18332 
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You have two sides   and the total of the THREE sides....just subtract the two sides from the total to find the remaining side length.

 

21 - 9 - 5 = 7" = AC

 Nov 13, 2018
 #2
avatar+1112 
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i got it thx

SmartMathMan  Nov 13, 2018
edited by SmartMathMan  Nov 13, 2018

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