You can resize any object. Only shapes, text boxes, and images can be rotated or flipped.
Tap an object, then drag any of its blue selection handles.
You can quickly match the sizes of two objects on the slide. You may find it easier to use both hands for this operation.
Select the object you want to resize, then drag a selection handle to begin resizing.
As you drag, touch and hold another object of the desired size.
When the words “Match Size” appear, lift both your fingers at the same time.
Tap a shape, a text box, or an image, place two fingers on it, then turn your hand in the direction you want to rotate the object.
After you start the rotation, you can continue by dragging with a single finger. A guide appears to indicate the angle of rotation.
Tap an object, then tap 
.
Tap Arrange, then tap Flip Vertically or Flip Horizontally.