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Mathematics and geometry in senior two are so abnormal @ ~ @
(1) Because the square area is 16 and the side length is 4, d (2,2).

(2) In y=2x+8, let y=2 and get x=-3.

∴t=2+3=5

(3) As shown in the figure: Δ POG ≌ΔPBE ≌ΔPME.

∴BM=2BE=2CD

While PC/CD=√2 and ∴PC/BM=√2/2 remain unchanged.