#1**+1 **

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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Guest Jun 10, 2021