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= 22/7x7x7
= 154cm^2
kalo kelipatan 7 gunakan 22/7
Luas =
phi × r × r =
22/7 × 7 cm × 7 cm =
1.078/7 =
154 cm^2
2.
Luas =
phi × r × r =
3,14 × 10 cm × 10 cm =
31,4 cm × 10 cm =
314 cm^2.
Smg membantu^_^