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https://prnt.sc/p9n5ke

 

thank you very much 

 Sep 23, 2019
 #1
avatar+10624 
+1

a = AB/2 = 7

e =F1M = 3

a2 = b2 + e2

b2 = a2 - e2

b2 = 49 - 9

b2 = 40

laugh

 Sep 23, 2019

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