Tolong Donk... (1 sampai 5) (tugas mandiri)

1) d = 24 cm --> r = 12 cm
L = π × r × r
L = 3,14 × 12 × 12
L = 452, 16 cm²

2) r = 6cm
L = π × r × r
L = 3,14 × 6 × 6
L = 113,04 cm²

3) L = π × r × r
314cm² = 3,14 × r × r
r² = 314 : 3,14 = 100
r = √100 = 10 cm

4) diameter : 21 dm -> r = 21/2 = 10,5 dm
L = 1/2 × π × r × r
L = 1/2 × 3,14 × 10,5 × 10,5
L = 173.0925 dm²

5) r = 7cm
L = 1/4 × π × r × r
L = 1/4 × 22/7 × 7 × 7
L = 38,5 cm²

semoga membantu, dikoreksi lagi ya, mohon maaf bila ada kesalahan, kalo ada yg ga ngerti tanya aja