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langkah pertama
L.per= π.d2( dua nya kuadrat)
154 = 22/7.d2
154x7= 22.d2
1078= 22.d2
d2= 1078/ 22
d= √49
d= 7
jd r= d/2= 3,5 cm
langkah dua,
volum bola= 4/3 x π.r3
= 4/3 x 3,14. (3,5)3
= 179,50
= dibulatkan jdnya 180 cm3
maaf ya klo salah
r²=Lp/4π=154/(4.22/7)=12,25
r=√12,25=3,5cm
Volume=4/3πr³=4/3.22/7.3,5³=179,67 cm²
2).
V1 : V2
πr²t : πr²t
π (2r)² 5t : π (3r)² 3t
π 4r² 5t : π 9r² 3t
20 πr²t : 27 πr²t
20 : 27
Jadi perbandingan V1:V2=20:27