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1.a)
Luas = 22/7 × 21 × 21
= 1.386 cm^2
1.b)
Luas = 3,14 × 25 × 25
=1.962,5 cm^2
((jari-jari = 1/2 × diameter))
2.a)
Luas = 3,14 × 25 × 25
= 1.962,5 m^2
2.b)
Luas = 22/7 × 0,7 × 0,7
= 1,54 m^2