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Prombu=d1*d2/2
d2=Prombu*2/d1
d2=120*2/10=24
a=bok rombu
a^2=12^2+5^2=169
a=13
Pb=10*20*4=800[cm²]
Pc=2*Pp+Pb
Pc=2*120+800=1040[cm²]
V=Pp*H
V=120*20=2400[cm³]
f=?
2Pp=240cm²
H=20cm
Pp=½ef
Pp=½*10f
Pp=5f
2*5f=240
10f=240
f=24
Pp=120
V=PpH
V=120*20=2400cm³
Pc=2Pp+Pb
Pb=4aH
z tw.Pitagorasa
(½e)²+(½f)²=a²
5²+12²=a²
25+144=a²
169=a²
a=13
Pb=4*13*20=1040cm²
Pc=240+1040=1280cm²