How to cut a circle in half in Illustrator tutorial

Learn how to cut a circle path in half in Illustrator

How do you cut a circle in half in Illustrator CC CS6 CS5 etc tutorial. There are many ways to cut a circle into halves in Illustrator. You can cut the circle into two halves by using divide and pathfinder command and removing the excess. You can also use the divide objects below command to cut a circle into half by using a single line. You can also use anchor point tool / pen tool to remove half of a circle in Illustrator. You can use the knife tool to cut a circle into two halves by using alt / option key. You can also use eraser tool and shift key to cut through a circle. The semi-circles can be moved apart and re-colored and scaled and rotated etc. This tutorial shows a number of methods to cut a circle in half in Illustrator

Select the ellipse tool in Illustrator toolbar
Draw circle by holding shift key down
View menu and smart guides ON
Draw a rectangle using the rectangle tool bigger than the circle
Shift the rectangle to cut the middle of circle (intersect will appear in the smart guide)
Pathfinder panel and divide
Object menu and ungroup
Delete remaining rectangle

As with many techniques in Illustrator, there are many ways to cut a circle in half. The above method uses the divide approach with a rectangle

Divide objects below / cut circle in half in Illustrator

Split into grid
Ellipse tool
Create a circle holding the shift down
Create a line using line segment tool top - down and bigger than the circle
Set line weight to 0 / stroke to no color
Select both paths using selection tool
Horizontal align center
Vertical align center
Keep line selected (de-select the circle)
Object menu
Path
Divide objects below

Circle has now been cut in half in Illustrator and can be moved apart by using the selection tool

Anchor tools and cut circle to semi circle

anchor tool and cut circle to semi circle in Illustrator

You can also use the anchor point tool and pen tool to cut a circle in half (well, actually, just turn the path into a semi circle and that can then be duplicate and combined again as a circle)

Select circle
Click the pen tool
Go to the far left point and click with pen tool
Go to the anchor point tool
Click the top far left handle
Click the bottom left handle (of the circle)

Knife tool to cut a circle in half in Illustrator

knife tool cut circle in half in Illustrator

Go to the eraser tool
Select the knife tool (beneath eraser tool)
Hover over top anchor point
hold alt / option
Draw through the top anchor
Through to the center
To the bottom anchor point

The alt / option key makes the knife a straight line knife

Eraser tool / circle into halves

eraser tool circle into half in Illustrator

You can also cut the circle into two halves in Illustrator by using the scissor tool in the toolbar. A little less accurate (zoom in to see the top of the circle)

Select circle
Eraser tool in toolbar
Double click erase tool
Set size to 0
Go to the top anchor point
Hold shift
Click top anchor and draw scissor downwards
Release after bottom anchor point

You can now select either side of the circle. The semi circle can be re-colored

Sources and references

cut halves and different colors in Illustrator

1. Cut and divide in Illustrator on Adobe.com

2. Shapes such as circles on wikipedia

3. Circles on Adobe.com

Other Resources

1. Circle fonts for Photoshop, psp etc