Penjelasan dengan langkah-langkah:
r = d ÷ 2
r = 56 ÷ 2
r = 28
a. keliling
K = πd
K = 22/7 × 56
K = 22 × 8
K = 176 cm
b. Luas
L = πr²
L = 22/7 × 28 × 28
L = 22 × 4 × 28
L = 88 × 28
L = 2.464 cm²
Diketahui:
Diameter = 56 cm
Ditanya:
Keliling = ? cm
Luas = ? cm²
Dijawab:
✎ Keliling:
• K = π × diameter
• K = ²²/7 × 56 cm
• K = 22 × 8 cm
• K = 176 cm
✎ Luas:
• L = πr²
• L = ²²/7 × ( 56 cm ÷ 2 )²
• L = ²²/7 × 28 cm²
• L = ²²/7 × 28 cm × 28 cm
• L = 22 × 4 cm × 28 cm
• L = 88 cm × 28 cm
• L = 2.464 cm²
Kesimpulan:
₊ Jadi, keliling dan luas lingkaran tersebut adalah 176 cm dan 2.464 cm²
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Penjelasan dengan langkah-langkah:
r = d ÷ 2
r = 56 ÷ 2
r = 28
a. keliling
K = πd
K = 22/7 × 56
K = 22 × 8
K = 176 cm
b. Luas
L = πr²
L = 22/7 × 28 × 28
L = 22 × 4 × 28
L = 88 × 28
L = 2.464 cm²
Diketahui:
Diameter = 56 cm
Ditanya:
Keliling = ? cm
Luas = ? cm²
Dijawab:
✎ Keliling:
• K = π × diameter
• K = ²²/7 × 56 cm
• K = 22 × 8 cm
• K = 176 cm
✎ Luas:
• L = πr²
• L = ²²/7 × ( 56 cm ÷ 2 )²
• L = ²²/7 × 28 cm²
• L = ²²/7 × 28 cm × 28 cm
• L = 22 × 4 cm × 28 cm
• L = 88 cm × 28 cm
• L = 2.464 cm²
Kesimpulan:
₊ Jadi, keliling dan luas lingkaran tersebut adalah 176 cm dan 2.464 cm²