tolong jawabannya dam caranya

2. K Lingkaran = (phi) × d
= 22/7 × 21 cm
= 66 cm

L Lingkaran = (phi) × r × r
= 3,14 × 10,5 cm × 10,5 cm
= 346,185 cm^2

3. K Lingkaran = (phi) × d
= 3,14 × 20 cm
= 62,8 cm
L Lingkaran = (phi) × r × r
= 3,14 × 10 cm × 10 cm
= 314 cm^2



Maaf ya 4 dan 5nya agak buram gak kelihatan...