How to Create a Half Sphere in SketchUp

Create a circle.

Create a Circle in SketchUp. Change your perspective and create another circle.

Draw a line on the bottom of the circle.

Click on the Pencil tool and draw a line on the bottom of the first circle. This will be used to separate the two halves of it.

Erase the bottom of the circle.

Click the Eraser tool and then 'erase' the bottom half.

Adjust the perspective.

Change your perspective so that you are looking down from the top, select the bottom circle, click on the Follow Me tool and then click on the 'upright' circle.

Erase the circle that created the path.

Use the eraser tool to erase the circle that created the path. The part that is not part of the dome.