To select another topic use the menu on the left of your screen. Scroll to the icon of the desired lesson and click on it.

Application: A sextant is an optical instrument used in navigation that measures the angle of celestial bodies above the horizon from the observer's position.

Measuring an angle.

Also: Angles was a Germanic tribe from which England derives its name. Angles is one of the German tribes that invaded England in the 5th century and established kingdoms.


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