tolong pake rumus luas dan keliling

A]
Mapel : Matematika
Bab : Bangun Datar

Diketahui :
- Diameter (d) = 14 cm
- Jari - Jari (r) = ½ × 14 cm = 7 cm

Ditanya :
- Luas Lingkaran (L) = .....?
- Keliling Lingkaran (K) = .....?

Penyelesaian :
- Luas Lingkaran (L) :
L = π × r × r
L = 22/7 × 7 cm × 7 cm
L = 22 cm × 7 cm
L = 154 cm²

- Keliling Lingkaran (K) :
K = π × d
K = 22/7 × 14 cm
K = 22 × 2 cm
K = 44 cm

B]
Mapel : Matematika
Bab : Bangun Datar

Diketahui :
- Jari - Jari (r) = 100 cm

Ditanya :
- Luas Lingkaran (L) = .....?
- Keliling Lingkaran (K) = .....?

Penyelesaian :
- Luas Lingkaran (L) :
L = π × r × r
L = 3,14 × 100 cm × 100 cm
L = 314 cm × 100 cm
L = 31.400 cm²

- Keliling Lingkaran (K) :
K = 2 × π × r
K = 2 × 3,14 × 100 cm
K = 6,28 × 100 cm
K = 628 cm

Maaf Kalau Salah

a) d = 14 cm, r = 7 cm
maka l = [tex] \pi r^2[/tex]
l = 22/7 x 7 x7
l = 154 cm^2

k = [tex] \pi [/tex] x d
k = 22/7 x 14
k = 44 cm

b) r = 100 cm, d = 200 cm
maka, l = 3,14 x 100 x 100
l = 31400 cm^2

k = 3,14 x 200
k = 628 cm