一道英语作文题，会的人请尽快回答。急!!!!!!!!!!!!!!!!!
0.28×4.5=1.26千克，就是面积乘以4.5，就是需要的重量了
不知道对不对。
(i)过P作PO⊥平面ABCD，连结OD
∵ABCD是正方形且AD=6
∴BD=6√2，则OD=3√2
∵PD=10
∴cos∠PDO=OD/PD=(3√2)/10
∴∠PDO=arccos(3√2)/10
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