P kuli = 4πr² r1 = 4 r2 = 2 P1 = 4π4² = 64π P2 = 4π2² = 16π Pc = 64π + 16π = 80 π 80 π = 4πr² | :4π 20 = r² r = 2√5 cm
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P kuli = 4πr²
r1 = 4
r2 = 2
P1 = 4π4² = 64π
P2 = 4π2² = 16π
Pc = 64π + 16π = 80 π
80 π = 4πr² | :4π
20 = r²
r = 2√5 cm