Protractor/Prism/Ray

PROTRACTORAn instrument for measuring angles just as a ruler is an instrument for measuring line segments.

PRISMA closed space figure. The bases are congruent polygons in parallel planes.

RAY • A point on a line and all the points in one direction from the point.

• Has infinite length and only one endpoint (vertex).

• The sides of the angle.

Illustration:

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