Sprendimas: GoUUw9 - 1
S_son =
π
* (R+r)* l
π
* (R+r)* l|
|
S_son = π* (R+r)* l$$S_{son}$$ = $$\pi\cdot (R+r)\cdot l$$
* (R+r)* l$$S_{son}$$ = $$\pi\cdot (R+r)\cdot l$$S_son = R* l* π+ r* l* π$$S_{son}$$ = $$R\cdot l\cdot \pi+r\cdot l\cdot \pi$$
+ r* l* π$$S_{son}$$ = $$R\cdot l\cdot \pi+r\cdot l\cdot \pi$$S_son = R* l* π+ l* r* π$$S_{son}$$ = $$R\cdot l\cdot \pi+l\cdot r\cdot \pi$$
+ l* r* π$$S_{son}$$ = $$R\cdot l\cdot \pi+l\cdot r\cdot \pi$$