MS Power Point
To maintain the perspective (height and width ratio) of an object when resizing, you need to

Drag a corner sizing handle
Press and hold the shift key while dragging a corner sizing handle & Drag a corner sizing handle
Press and hold the shift key while dragging a corner sizing handle
Press and hold the alt + ctrl keys while dragging a middle handle

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MS Power Point
How to create additional Guide Lines?

by holding Alt key, click on existing Guide Line and drag
Additional Guide Lines cannot be created
by holding Ctrl key, click on existing Guide Line and drag
by holding Ctrl + Alt key, click on existing Guide Line and drag

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