[tex]P=P_1+P_2+P_3+P_4\\\\P=\frac{|AE||EB|}{2}+\frac{|EC||EB|}{2}+\frac{|EC||ED|}{2}+\frac{|AE||ED|}{2}\\\\P=\frac{|AE||EB|+|EC||EB|+|EC||ED|+|AE||ED|}{2}\\\\P=\frac{|EB|(|AE|+|EC|)+|ED|(|EC|+|AE|)}{2}\\\\P=\frac{|EB||AC|+|ED|AC|}{2}\\\\P=\frac{|AC|(|EB|+|ED|)}{2}\\\\P=\frac{|AC||BD|}{2}[/tex]
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[tex]P=P_1+P_2+P_3+P_4\\\\P=\frac{|AE||EB|}{2}+\frac{|EC||EB|}{2}+\frac{|EC||ED|}{2}+\frac{|AE||ED|}{2}\\\\P=\frac{|AE||EB|+|EC||EB|+|EC||ED|+|AE||ED|}{2}\\\\P=\frac{|EB|(|AE|+|EC|)+|ED|(|EC|+|AE|)}{2}\\\\P=\frac{|EB||AC|+|ED|AC|}{2}\\\\P=\frac{|AC|(|EB|+|ED|)}{2}\\\\P=\frac{|AC||BD|}{2}[/tex]