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Answer d^2+ (b^3)/4  

 

Regards and thanks for all your help!

 Jun 11, 2022
 #1
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Dear All >>> APOLOGIES>>>the answer should be  --  d^2 + (b^2)/4....I will post workings asap. Thanks again.

 Jun 15, 2022
 #2
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Hope this clarifies:

 

 Jun 16, 2022

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