[tex]a=4\ mm\\b=3\ mm\\c=5\ mm\\H=7\ mm\\\\P_p=\frac{a*b}{2}=\frac{4*3}{2}\ mm^2=\frac{12}{2}\ mm^2=6\ mm^2\\\\P_b=a*H+b*H+c*H=4\ mm*7\ mm+3\ mm*7\ mm+5\ mm*7\ mm=\\=28\ mm^2+21\ mm^2+35\ mm^2=84\ mm^2\\\\P_c=2P_p+P_b=2*6\ mm^2+84\ mm^2=12\ mm^2+84\ mm^2=96\ mm^2[/tex]
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[tex]a=4\ mm\\b=3\ mm\\c=5\ mm\\H=7\ mm\\\\P_p=\frac{a*b}{2}=\frac{4*3}{2}\ mm^2=\frac{12}{2}\ mm^2=6\ mm^2\\\\P_b=a*H+b*H+c*H=4\ mm*7\ mm+3\ mm*7\ mm+5\ mm*7\ mm=\\=28\ mm^2+21\ mm^2+35\ mm^2=84\ mm^2\\\\P_c=2P_p+P_b=2*6\ mm^2+84\ mm^2=12\ mm^2+84\ mm^2=96\ mm^2[/tex]