Enter the distance, length, and angle into the calculator to determine the angular size of a triangle.

## Angular Size Formula

The following formula is used to calculate the angular size.

D = 2 * L * tan (a/2)

- Where D is the angular size
- L is the radius/length depicted below
- a is the angle depicted below

## FAQ

**What is an angular size?**

An angular size is a value of length that represents the total length of a field of view from a point of a triangle, a certain radius, and certain angle. This can be seen as D in the above depiction.

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