The tich hinh lap phuong H :
10 x 10 x 10 x 8 = 8000 ( cm3 )
Theo hinh ve , ta co canh hinh lap phuong H gap 2 lan canh hinh la phuong nho .
Canh hinh lap phuong H :
10 x 2 = 20 ( cm )
Dien tich hinh lap phuong H :
20 x 20 x 6 =2400 ( cm2 )
Dap so : a) 8000 cm3
b)2400 cm3