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1. 3,14 x 20² = 1.256 cm
cara sama :
2. 2.826cm
3. 616cm
4. 452,16cm
5. 23.788, 29cm
3,14x30x30= 2826 cm2
3,14x14x14= 615,44 cm2
3,14x12x12= 452,16 cm2
22/7x87x87= 23788,2857141 cm2