英语翻译The points A(1,2),B(3,5),C(6,6) and D form a parallelogr

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英语翻译
The points A(1,2),B(3,5),C(6,6) and D form a parallelogram.Find the coordinates of the mid-point of AC.Use your answer to find the coordinates of D.
The point P is the foot of the perpendicular form the point A(0,3) to the line y=3x.
(a) Find the equation of the line AP.
(b) Find the coordinates of the point P.
(c) Find the perpendicular distance of A form the line y=3x.
The volume,Vm3,of l meters of wire is given by V=πr2lwhere r meters is the radius of the clrular cross-section.
(a)Find the volume of 80m of wire with radius of cross-section 2×10－3m
(b)Another type of wire has radius of cross-section 5×10－3m.What legth of this wire has a volume of 8×10－3m.
(c)Another type of wire is such that a length of 61m has a volume of 6×10－3m.Find the radius of the cross-section.

点ABCD构成一个平行四边形,请找到线段AC的中点的坐标,然后用这个点找出D点的坐标.
点P是点A到直线y=3x的垂足
求AP解析式
求点P坐标
求点A到直线y=3x的垂直距离
再问：可不可以把我补充的也翻译一下！谢谢

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