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[tex]a 1 over 2 (a +b) h for a [/tex]

Sagot :

[tex]A=\frac{1}{2}(a+b)h \\\\ 2A=(a+b)h \\\\ a+b=\frac{2A}{h} \\\\ \boxed{a=\frac{2A}{h}-b}[/tex]