Geometry Vocabulary Mr. Fiore & Mr. Ryan. What is Geometry? Geometry is the study of shapes They studied Geometry in Ancient Mesopotamia & Ancient Egypt.

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Presentation transcript:

Geometry Vocabulary Mr. Fiore & Mr. Ryan

What is Geometry? Geometry is the study of shapes They studied Geometry in Ancient Mesopotamia & Ancient Egypt Geometry is important in the art and construction fields

POINT A POINT is an exact location on a graph, shape or in “space”. The Hershey Kiss is a POINT on the line ●

LINE A LINE goes in opposite directions and never, never, never ends. Imagine if this Twizzler went on forever and ever and ever and ever and ever and ever

RAY A RAY is part of a line, but it has one endpoint and the other end keeps going. ● Endpoint Raaaaaaaaaaaaaaaaaaaaaaaayyyyyyyyyyyyyyyyyyyyyyyyyyy

ENDPOINT An ENDPOINT is a point at the end of a ray or line segment. Endpoint

LINE SEGMENT A LINE SEGMENT is part of a ray or line. It has two endpoints ●● Line Segment Line Ray ● Endpoints

VERTEX A VERTEX is a fancy name for “angle” Two rays or lines that have the same endpoint make a VERTEX/angle VERTEX/angles are measured in “degrees” The Corners of a square are its vertex/angles When two lines cross, they make vertex/angles

CONGRUENT CONGRUENT means the “same” CONGRUENT LINE SEGMENTS means two line segments are the same CONGRUENT Vertex/Angles means two angles are the same ●● ● ● The Hershey & Crunch Bar are a Congruent size

VERTICAL LINE A VERTICAL LINE goes up & down The candy bars are vertical

HORIZONTAL LINE A HORIZONTAL LINE goes “across” (left and right) The candy bars are Horizontal

PLANE  A PLANE (no, not the one that flies!) is a flat surface that goes on forever in all directions.  Imagine sitting on a row boat in the middle of the ocean. No matter which way you look…all you see is water…forever.

OPEN & CLOSED FIGURES A CLOSED FIGURE/SHAPE starts and ends at the same point. An OPEN FIGURE/SHAPE does NOT start and end at the same point. CLOSEDOPEN ● ● ● Start End Start End

POLYGON A POLYGON is a “closed” shape A POLYGON is made up of line segments that do not cross. The number of sides gives a POLYGON its name POLYGON NOT POLYGON

PROTRACTOR We use a PROTRACTOR to measure vertex/angles in degrees

4 TYPES OF ANGLES ACUTE ANGLES are less than 90°

4 TYPES OF ANGLES RIGHT ANGLES measure exactly 90 ° The “square” symbol means 90’

4 TYPES OF ANGLES OBTUES ANGLES are greater than 90 ° but less than 180 °

4 TYPES OF ANGLES STRAIGHT ANGLE is exactly 180 °

ANGLES When you “name” an angle. The vertex/angle “letter/number” goes in the center of the label A B C If I wanted to know the measurement of Angle A…I would ask:” What is the measurement for BAC?” (Notice A is in the center)

The End Once you study all the “fancy words”, Geometry is very easy to understand…so STUDY!

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