jari-jari (r) = 141
luas...?
luas lingkaran
= π × r²
= 3,14 × 141 × 141
= 62.426,34
--------------------------------
diameter (d) = 240 → r = 240 ÷ 2 = 120
= 3,14 × 120 × 120
= 45.216
diameter (d) = 280 → r = 280 ÷ 2 = 140
= 22/7 × 140 × 140
= 61.600
diameter (d) = 480 → r = 480 ÷ 2 = 240
= 3,14 × 240 × 240
= 180.864
jari-jari (r) = 20 cm → d = 20 cm × 2 = 40 cm
keliling...?
keliling lingkaran
= π × d
= 3,14 × 40 cm
= 125,6 cm
jari-jari (r) = 29 → d = 29 × 2 = 58
= 3,14 × 58
= 182,12
jari-jari (r) = 70 → d = 70 × 2 = 140
= 22/7 × 140
= 440
luas = 616
jari jari (r)...?
luas = 22/7 × r²
616 = 22/7 × r²
r² = 616 ÷ 22/7
r² = 616 × 7/22
r² = 28 × 7
r² = √196
= 14
━O━O━━━━━━━━━
・:。@justfebyy・:三
━━━━━━━━━━━━━
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diketahui :
jari-jari (r) = 141
ditanya :
luas...?
dijawab :
luas lingkaran
= π × r²
= 3,14 × 141 × 141
= 62.426,34
--------------------------------
diketahui :
diameter (d) = 240 → r = 240 ÷ 2 = 120
ditanya :
luas...?
dijawab :
luas lingkaran
= π × r²
= 3,14 × 120 × 120
= 45.216
--------------------------------
diketahui :
diameter (d) = 280 → r = 280 ÷ 2 = 140
ditanya :
luas...?
dijawab :
luas lingkaran
= π × r²
= 22/7 × 140 × 140
= 61.600
--------------------------------
diketahui :
diameter (d) = 480 → r = 480 ÷ 2 = 240
ditanya :
luas...?
dijawab :
luas lingkaran
= π × r²
= 3,14 × 240 × 240
= 180.864
--------------------------------
diketahui :
jari-jari (r) = 20 cm → d = 20 cm × 2 = 40 cm
ditanya :
keliling...?
dijawab :
keliling lingkaran
= π × d
= 3,14 × 40 cm
= 125,6 cm
--------------------------------
diketahui :
jari-jari (r) = 29 → d = 29 × 2 = 58
ditanya :
keliling...?
dijawab :
keliling lingkaran
= π × d
= 3,14 × 58
= 182,12
--------------------------------
diketahui :
jari-jari (r) = 70 → d = 70 × 2 = 140
ditanya :
keliling...?
dijawab :
keliling lingkaran
= π × d
= 22/7 × 140
= 440
--------------------------------
diketahui :
luas = 616
ditanya :
jari jari (r)...?
dijawab :
luas = 22/7 × r²
616 = 22/7 × r²
r² = 616 ÷ 22/7
r² = 616 × 7/22
r² = 28 × 7
r² = √196
= 14
━O━O━━━━━━━━━
・:。@justfebyy・:三
━━━━━━━━━━━━━