Calculation: ijeBRJ - 1
S =
π
* (R+r)* l+ π* R^2+ π* r^2
π
* (R+r)* l+ π* R^2+ π* r^2|
|
S = π* (R+r)* l+ π* R^2+ π* r^2$$S$$ = $$\pi\cdot (R+r)\cdot l+\pi\cdot R^{2}+\pi\cdot r^{2}$$
* (R+r)* l+ π* R^2+ π* r^2$$S$$ = $$\pi\cdot (R+r)\cdot l+\pi\cdot R^{2}+\pi\cdot r^{2}$$S = R* l* π+ r* l* π+ R^2* π+ r^2* π$$S$$ = $$R\cdot l\cdot \pi+r\cdot l\cdot \pi+R^{2}\cdot \pi+r^{2}\cdot \pi$$
+ r* l* π+ R^2* π+ r^2* π$$S$$ = $$R\cdot l\cdot \pi+r\cdot l\cdot \pi+R^{2}\cdot \pi+r^{2}\cdot \pi$$S = R* l* π+ l* r* π+ R^2* π+ r^2* π$$S$$ = $$R\cdot l\cdot \pi+l\cdot r\cdot \pi+R^{2}\cdot \pi+r^{2}\cdot \pi$$
+ l* r* π+ R^2* π+ r^2* π$$S$$ = $$R\cdot l\cdot \pi+l\cdot r\cdot \pi+R^{2}\cdot \pi+r^{2}\cdot \pi$$