DeltaPQR is an equilateral triangle.X,Y,...

`DeltaPQR` is an equilateral triangle.X,Y,Z are the mid points of the sides and A,B,C are mid-points of sides of `DeltaXYZ`. If the perimeter of `DeltaPQR` is 8.4cm., then the perimeter of `DeltaABC`=

A

4.2cm.

B

8.4 cm.

C

2.1cm.

D

2.8 cm.

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