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

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

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MS Power Point
What is the use of 'Hide Slide' option?

to hide the selected slides during Printing
to hide the selected slides during Presentation
to hide the selected slides during Deleting
to hide the selected slides during Editing

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