Class inheritance in C + +, need some help

Hello, I need help in writing the program, who can - something across, or similar tasks are examples. I must implement class inheritance
Parent Class - object.
properties: coordinates.
Methods: movement.
Outgoing classes:
1) The parallelepiped
properties: size (length, width, height)
Methods: The change of size.
2) Scope
properties: radius
Methods: The change of the radius change of the radius.
Help please do not understand how to set figures in C + +

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