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Help please!@CPhill

 Jun 10, 2021
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To prove A = 1/2•ab•sinC    

 

What is sinC ... it's the opposite over the hypotenuse, so call sinC as h/a 

 

Now, A = 1/2 • ab • h/a  

 

The a's cancel, leaving A = 1/2 • b • h  or  one-half the base times the height, the standard formula for area of a triangle  

 

Is that good enough proof?  

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 Jun 10, 2021

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