Half-sphere roof

The roof above the castle tower has the shape of a 12.8 m diameter half-sphere. What is this roof's cost if the cost of 1 square meter is 12 euros and 40 cents?

Correct answer:

x =  2994.92 Eur

Step-by-step explanation:

D=12.4 m r=D/2=12.4/2=531=6.2  S=21 4π r2=21 4 3.1416 6.22241.5256 m2  x=12.40 S=12.40 241.5256=2994.92 Eur

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