Question

Quiss

Tentukan jari² dan luas lingkaran jika diameter nya :
a. 24cm
b. 140cm
​

Answer 1

Jawaban:

a.) d = 24cm

r = d ÷ 2 = 24 ÷ 2 = 12cm

Luas lingkaran:

• πr²
• 3,14 × 12 × 12
• 3,14 × 144
• 452,16cm²

b.) d = 140cm

r = d÷2 = 140÷2 = 70cm

Luas lingkaran:

• πr²
• 22/7 × 70 × 70
• 22 × 10 × 70
• 220 × 70
• 15.400cm²

Answer 2

a. Diameter = 24

r = D : 2

r = 24 : 2

r = 12 cm

L = π × r × r

L = 3,14 × 12 × 12

L = 37,68 × 12

L = 452,16 cm²

b. diameter = 140

R = D : 2

R = 140 : 2

R = 70 cm

L = π × r × r

L = 22/7 × 70 × 70

L = 22 × 10 × 70

L = 220 × 70

L = 15.400 cm²