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Geometry VocabularyGeometry Vocabulary
Powerpoint hosted on www.worldofteaching.comPlease visit for 100’s more free powerpoints
What is Geometry?What is Geometry?
Geometry is the study of shapesGeometry is the study of shapes
They studied Geometry in Ancient They studied Geometry in Ancient Mesopotamia & Ancient EgyptMesopotamia & Ancient Egypt
Geometry is important in the art and Geometry is important in the art and construction fieldsconstruction fields
An exact position or location
POINTPOINT
A POINT is an exact location on a graph, A POINT is an exact location on a graph, shape or in “space”.shape or in “space”.
The Hershey Kiss is a POINT on the lineThe Hershey Kiss is a POINT on the line
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LINELINE
A LINE goes in opposite directions and A LINE goes in opposite directions and never, never, never ends.never, never, never ends.
Imagine if this Twizzler went on forever and ever and ever and ever and ever and ever
RAYRAY
A RAY is part of a line, but it has one A RAY is part of a line, but it has one endpoint and the other end keeps going.endpoint and the other end keeps going.
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Endpoint
Raaaaaaaaaaaaaaaaaaaaaaaayyyyyyyyyyyyyyyyyyyyyyyyyyy
ENDPOINTENDPOINT
An ENDPOINT is a point at the end of a An ENDPOINT is a point at the end of a ray or line segment.ray or line segment.
Endpoint
LINE SEGMENTLINE SEGMENT
A LINE SEGMENT is part of a ray or line.A LINE SEGMENT is part of a ray or line.
It has two endpointsIt has two endpoints
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Line Segment
Line Line
Ray
●Endpoints
RAY: A part of a line, with one endpoint, that continues without end in one direction
LINE: A straight path extending in both directions with no endpoints
LINE SEGMENT: A part of a line that includes two points, called endpoints, and all the points between them
VERTEXVERTEX
A VERTEX is a fancy name for “angle”A VERTEX is a fancy name for “angle”
Two rays or lines that have the same Two rays or lines that have the same endpoint make a VERTEX/angleendpoint make a VERTEX/angle
VERTEX/angles are measured in VERTEX/angles are measured in “degrees”“degrees”
The Corners of a square are its vertex/angles
When two lines cross, they make vertex/angles
CONGRUENTCONGRUENT
CONGRUENT means the “same”CONGRUENT means the “same”
CONGRUENT LINE SEGMENTS means CONGRUENT LINE SEGMENTS means two line segments are the sametwo line segments are the same
CONGRUENT Vertex/Angles means two CONGRUENT Vertex/Angles means two angles are the sameangles are the same
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The Hershey & Crunch Bar are a Congruent size
VERTICAL LINEVERTICAL LINE
A VERTICAL LINE goes up & downA VERTICAL LINE goes up & down
The candy bars are vertical
HORIZONTAL LINEHORIZONTAL LINE
A HORIZONTAL LINE goes “across” (left A HORIZONTAL LINE goes “across” (left and right)and right)
The candy bars are Horizontal
INTERSECTING LINES: Lines that cross
PARALLEL LINES: Lines that never cross and are always the same distance apart
Perpendicular LinesPerpendicular Lines
Two lines that intersect to form four right angles
OPEN & CLOSED FIGURESOPEN & CLOSED FIGURES
A CLOSED FIGURE/SHAPE starts and A CLOSED FIGURE/SHAPE starts and ends at the same point.ends at the same point.
An OPEN FIGURE/SHAPE does NOT An OPEN FIGURE/SHAPE does NOT start and end at the same point.start and end at the same point.
CLOSED OPEN
●●
●
Start
End
Start
End
POLYGONPOLYGON
A POLYGON is a “closed” shapeA POLYGON is a “closed” shape
A POLYGON is made up of line segments A POLYGON is made up of line segments that do not cross. that do not cross.
The number of sides gives a POLYGON The number of sides gives a POLYGON its nameits name
POLYGON
NOT POLYGON
The figure formed when two rays share the same endpoint
Right Angle:An angle that forms a square corner
Acute Angle:An angle less than a right angle
Obtuse Angle:An angle greater than a right angle
3 TYPES OF ANGLES3 TYPES OF ANGLES
ACUTE ANGLES are less than 90ACUTE ANGLES are less than 90°°
3 TYPES OF ANGLES3 TYPES OF ANGLES
RIGHT ANGLES measure exactly 90 RIGHT ANGLES measure exactly 90 °°The “square” symbol means 90’
Right Angle
Right Angle
Not! Not!
Not!
Not!
3 TYPES OF ANGLES3 TYPES OF ANGLES
OBTUES ANGLES are greater than 90 OBTUES ANGLES are greater than 90 ° ° but less than 180 °but less than 180 °
ANGLESANGLES
When you “name” an angle. The When you “name” an angle. The vertex/angle “letter/number” goes in the vertex/angle “letter/number” goes in the center of the labelcenter 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)