Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Angle:

"

Conventionally, angle size is measured "between" the sides through the interior of the angle and given as a magnitude or scalar quantity. At other times it might be measured through the exterior of the angle or given as a signed number to indicate a direction of measurement.[citation needed]