The crane

The construction crane has a 20m long arm. What construction area in ares can it handle from this crane if it rotates around its axis?

Correct answer:

S =  12.57 a

Step-by-step explanation:

r=20 m  S1=π r2=3.1416 2021256.6371 m2  S=S1 a=S1:100  a=1256.6371:100  a=12.57 a=12.57 a

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