Usually we use these shapes as buttons or hyperlinks. Indeed, you can also use these shapes to crop a picture in PowerPoint. How to do it?
Method 1: Insert Shape first.
Step 1: Choose any shape from: Insert > Shapes. Drag your mouse and draw the shape.
Step 2: Right click on the shape and choose Format Shape.
Step 3: In the Fill tab, choose Picture or Texture Fill.
Step 4: Click Insert from File…, and select the picture you want to crop. Now you will see the picture be cropped like this:
Method 2: Insert picture first.
Step 1: Insert the desired picture: Insert > Picture.
Step 2: Select the picture, and from the Picture toolbar, click Picture Shape, and from the drop down lists, choose a shape.
Then you will also see the picture like below:
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