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tinggi tabung = diameter bola = 2r
Luas bola = 4πr^2
Luas selimut tabung = 2πrt = 2πr(2r) = 4πr^2
jadi terbukti luas bola = luas selimut tabung
jari² tabung = jari² bola
tinggi tabung = diameter bola
<=> t = 2r
Luas selimut tabung = luas permukaan bola
2πrt = 4πr²
2πr x 2r = 4πr²
2 x 2 π r x r = 4πr²
4πr² = 4πr²
( terbukti !!! )