S_san = 2* π
* r* h$$S_{san}$$ = $$2\cdot \pi\cdot r\cdot h$$ 
S_san = 2* h* r* π
$$S_{san}$$ = $$2\cdot h\cdot r\cdot \pi$$ 
S_san = 2* 2.12* 3.14* 3.14$$S_{san}$$ = $$2\cdot 2.12\cdot 3.14\cdot 3.14$$

S_san = 41.804704$$S_{san}$$ = $$41.804704$$

S_san = 41.8047$$S_{san}$$ = $$41.8047$$
