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2. luas 1 = 28 cm × 80 cm = 2.240cm2
luas 2 = 1/2 × 22/7 × 14cm × 14cm = 308 cm2
luas seluruhnya = 2.240cm2 + 308cm2 = 2.548cm2
3. luas diarsir = 1/3 × 22/7 × 21cm × 21cm = 462cm2
5. volume = ( 1/2 × 20cm × 24cm ) × 50cm
240cm2 × 50 cm = 12.000cm3
7.d