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2.luas alas = 1per2 ×16×12
=192÷2=96
volume=96×42=4032
3. 2688÷28=96
4. volume=10800
luas=270
=10800÷270=40
5.luas alas = 1per2 ×36×15
=540÷2=270
volume = 270×48=12960
=12960+270=13230