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Jawab:
L1=P × l
=42 × 50
=2100
L2=Diameter:42
Jari2=42 ÷ 2 = 21
=
Dari rumus diatas,Kenapa di bagi 2?
Jawab=Karena disana ada setengah lingkaran.
=2100 - 693
=B.1407 cm2
Maaf kalau salah....
Semoga membantu