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r = 100
π = 3,14
dit : luas daerah yg di arsir = ??
jwb
Luas daerah = π ×r × r
=3,14 × 100 × 100
=3140
jika yg diarsir setenga lingkaran maka di bagi 2
3,14di kali 100 di kali 100
31400cm²
luas yang di arsir?
Luas:2
31400:2 = 15700 cm²