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

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

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MS Power Point
How do you add degrees of transparency to shapes such as arrows, so that the slide background shows though?

Use the Set Transparent Color button on the Picture toolbar
All of above
Use #D style 4 button on the drawing toolbar
Use the Transparency slider in the Format AutoShapes dialog box

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