Point
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It is a very basic concept which cannot be defined. Undefined terms are used to define other concepts. In Euclidean geometry, for example, point, line and plane are not defined.
There are 90 degrees in a left angle as there are in a right angle but the term 'left angle' is rarely used
Goniometer
Angles are units of measure that define the relationships between two intersecting lines It's tough to demonstrate by text, but I'm goind to give it a try; _\ = an angle of about 60 degrees _/ = an angle of about 120 degrees _| = an angle of 90 degrees (also called a 'right' angle) _._ = an angle of about 180 degrees = is an angle of about 0 degrees
A protractor is used to measure an angle.