1dm^2=10cm * 10cm = 100cm^2
12 * 100$cm^2$ 1200 cm^2
Pp_1=1200cm^2
Pp_2=768cm^2
Pp=4R^2
1200=4R^2/:4
300=R^2
r=10\sqrt3
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768=4R^2 /:4
192=R^2
r=8\sqrt3
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V=\frac{4}{3} R ^3
V= 10$\sqrt{3} ^3$
v=3000\sqrt3
v=8\sqrt3 ^3
v=1536 \sqrt3
3000\sqrt3 / 1536\sqrt3=195,32