If you want to input arc AB in the formula editor, the most difficult thing is to type the radian symbol, which is very simple in mathtype formula editor. There are two ways:

When the angle is given in radians, radian units are usually not written.

Method 1: Enter directly.

1. After opening MathType software, select the radian mark saved under the Geometry tab.

Select the saved radian marker in the Geometry tab.

Method 2: Step by step input

1. After opening MathType software, select "Bottom Line and Top Line" template in MathType toolbar and select "Arc Line".

2. Enter the corresponding radian characters, close and save.

Input the corresponding radian characters through the keyboard.

When editing formulas with MathType, the input of MathType radian symbols is relatively simple. As long as you are familiar with the location of various symbol templates, you can easily enter them. At present, this software is engaged in double eleven activities, you can have a look if necessary.