bantuin dong;) Luas permukaan bola yg berjari-jari 4cm

r = 4
[tex]Lp=4\pi r^2 \\ Lp=4\times 3.14\times 4^2 \\ Lp=12.56\times 16 \\ Lp=200.96$ cm^2$[/tex]

L = 4 phi r kuadrat
= 4 x 3,14 x 4 x 4
= 200,96 cm kuadrat