PowerPoint is a great way to manipulate shapes that you insert into a presentation. Regardless of whether you want to merge two shapes or change a shape using the edit points, PowerPoint has one option.
First, open PowerPoint and select the shape you want to change. If you have not yet inserted a shape into your presentation, you can do so under Insert> Forms> Select Shape. In this example, an isosceles triangle is used.
Once you have selected your shape, you will see a new Form Format tab appear. Continue and select it.
Then go to the "Insert Forms" group and click the "Edit Shape" button.
A drop-down menu appears. Select the "Edit Points" command in the menu.
To change the shape, click on the black handles and drag them to the desired location.
You may also see some white edit points. You can use these to change the curvature of the line between two black edit points.
This way, you can completely change the structure of your shape. It's a simple technique, but it can provide some interesting results.