Luas permukaan tabung = 2× luas alas + luas selimut.
L t = 2.πr^2 + 2πr × 2r ( 2r = tinggi tabung)
L t = 2.πr^2 + 4πr^2
L t = 6 πr^2.
Luas permukaan bola = 4 πr^2
Perbandingan => 6 πr^2 : 4 πr^2
=> 6 : 4
=> 3 : 2
luas permukaan bola = 2/3 × 315 = 210
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Luas permukaan tabung = 2× luas alas + luas selimut.
L t = 2.πr^2 + 2πr × 2r ( 2r = tinggi tabung)
L t = 2.πr^2 + 4πr^2
L t = 6 πr^2.
Luas permukaan bola = 4 πr^2
Perbandingan => 6 πr^2 : 4 πr^2
=> 6 : 4
=> 3 : 2
luas permukaan bola = 2/3 × 315 = 210