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step 1
_ _ _ _
Ka = 2•π•R/2
Ka = π•R
Ka = 22/7•3,5
Ka = 11 m
step 2
_ _ _ _
Kb = 2•π•r/2
Kb = π•r
Kb = 22/7•1,4
Kb = 4,4 m
step 3
_ _ _ _
Ktot = Ka + 2•Kb + 1,4
Ktot = 11 + 2•4,4 + 1,4
Ktot = 11 + 8,8 + 1,4
Ktot = 21,2 m
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