1. dik : jari-jari = 14 cm
tinggi = 20 cm
π = 22/7
dit : volume tabung = ... ?
penyelesaian :
volume = π x r² x t
= 22/7 x (14)² x 20
= 22/7 x 196 x 20
= 22 x 28 x 20
volume = 12.320 cm³
2. dik : diameter = 70 cm
jari-jari = 35 cm
dit : luas lingkaran = ... ?
luas = π x r²
= 22/7 x (35)²
= 22/7 x 1.225
= 22 x 175
luas = 3.850 cm²
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1. dik : jari-jari = 14 cm
tinggi = 20 cm
π = 22/7
dit : volume tabung = ... ?
penyelesaian :
volume = π x r² x t
= 22/7 x (14)² x 20
= 22/7 x 196 x 20
= 22 x 28 x 20
volume = 12.320 cm³
2. dik : diameter = 70 cm
jari-jari = 35 cm
π = 22/7
dit : luas lingkaran = ... ?
penyelesaian :
luas = π x r²
= 22/7 x (35)²
= 22/7 x 1.225
= 22 x 175
luas = 3.850 cm²
• V. tabung
= 22/7 × 14 × 14 × 20
= 22/7 × 3.920
= 86.240 / 7
= 12.320 cm^3 ✔
No. 2
d = 70 cm
r = 70 : 2 = 35 cm
• l. lingkaran
= 22/7 × 35 × 35
= 26.950 / 7
= 3.850 cm^2 ✔