Albert1
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fine ,you got it !Opalg said:[sp]From the formula $\frac12bc\sin A$ for the area of a triangle, each of the coloured regions $R,S,T$ has the same area as the triangle $ABC$. This is maximised when $AB$ is perpendicular to $AC$. The area of each region is then $10$ and their combined area is $30.$[/sp]