To remove portions of an image in PowerPoint, follow these steps:
1. Open PowerPoint and go to the slide where you have inserted the image.
2. Select the image by clicking on it once. This will display the "Picture Tools" tab on the ribbon.
3. On the "Picture Tools" tab, click on the "Format" tab. This will open the formatting options for the selected image.
4. In the "Size" group, you will find options to change the size of the image. To change the size proportionally, you can click on the "Crop" button and select "Crop to Fill." This will remove portions of the image to fit the desired size without distorting the image.
5. You can also click on the "Resize" button in the "Size" group to specify a custom size by entering the dimensions in the "Height" and "Width" boxes, or dragging the handles on the corners and sides of the image.
By following these steps, you can remove portions of an image and change the size of an image in PowerPoint.