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Pp = πr²
36π = πr²
36 = r²
r = 6
l - ramię stożka
l = 2r
l = 2 × 6
l = 12 cm
Pc = Pp + Pb
Pc = πr² + πrl
Pc = 36 × 3,14 + 3,14 × 6 × 12
Pc = 113,04 + 226,08
Pc = 339,12 cm³
Pkartonu = a × b
Pkartonu = 1,5 m × 1 m
Pkartonu = 1,5 m² = 15000 cm²
15000 cm² ÷ 339,12 cm² = 44
Odp. Z tego kartnu można wykonać 44 czapki.