Jawaban:
1.
a. 10 cm
b. 62,8 cm
c. 314 cm²
2.
a. 125,6 cm
b. 1.256 cm²
c. 40 cm
Penjelasan dengan langkah-langkah:
a.
r = d ÷ 2
r = 20 ÷ 2
r = 10
b.
K = 2 × π × r
K = 2 × 3,14 × 10
K = 6,28 × 10
K = 62,8
c.
L = π × r × r
L = 3,14 × 10 × 10
L = 3,14 × 100
L = 314 cm²
K = 2 × 3,14 × 20
K = 6,28 × 20
K = 125,6 cm
L = 3,14 × 20 × 20
L = 3,14 × 400
L = 1.256 cm²
d = 2 × r
d = 2 × 20
d = 40 cm
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^_^
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Jawaban:
1.
a. 10 cm
b. 62,8 cm
c. 314 cm²
2.
a. 125,6 cm
b. 1.256 cm²
c. 40 cm
Penjelasan dengan langkah-langkah:
1.
a.
r = d ÷ 2
r = 20 ÷ 2
r = 10
b.
K = 2 × π × r
K = 2 × 3,14 × 10
K = 6,28 × 10
K = 62,8
c.
L = π × r × r
L = 3,14 × 10 × 10
L = 3,14 × 100
L = 314 cm²
2.
a.
K = 2 × π × r
K = 2 × 3,14 × 20
K = 6,28 × 20
K = 125,6 cm
b.
L = π × r × r
L = 3,14 × 20 × 20
L = 3,14 × 400
L = 1.256 cm²
c.
d = 2 × r
d = 2 × 20
d = 40 cm
Semoga Membantu
^_^