GEOMETRY
Point
Line
A
A spot or dot.
B
A line that never ends. It goes forever.
Line Segment
A
A section of a line.
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B
Ray
A line beginning from a point.
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Parallel
Lines
Lines that never cross.
The l’s in the word are parallel.
Intersecting
Lines
Lines that cross
like an intersection
of a road.
More Intersecting
Lines
Perpendicular
Lines
Intersecting at
right angles like a “t”.
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ANGLES
2 rays coming
from only 1 point.
Right Angle
A 90o angle.
Acute Angle
Smaller than a right angle.
Isn’t that “a cute” little angle?
Obtuse Angle
Bigger than a right angle.
“O Boy” that’s a big angle!
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LABELING
Labeling Lines
Points
Label a point
with a capital letter.
A
AB
B
A
Labeling Segments
B
Labeling Rays
AB
AB
A
B
Labeling Angles
ABC or
A
B
Labeling Shapes
CBA
This is the angle symbol and
it looks the same for every angle!
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ABC
BCA
CAB
2D SHAPES
Congruent
the same size and shape.
Circle
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Sym metrical
when 2 halves are
mirror images
of each other.
Oval
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POLYGONS
O
a closed figure made up
of 3 or more line segements.
a polygon with
8 sides
Hexagon
Pentagon
a polygon with
a polygon with
six sides
5 sides
(Like the Pentagon in Washington, DC)
Quadrilateral
Triangle
4 sides
3 sides
a polygon with
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a polygon with
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QUADRILATERALS
a polygon with
4 sides
Parallelogram
Trapezoid
a quadrilateral with both opposite
sides that are parallel and congruent.
a quadrilateral with
only 2 parallel sides
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PARALLELOGRAMS
a quadrilateral with opposite sides
that are parallel and congruent.
Rhombus
Rectangle
a parallelogram with
4 congruent sides
a parallelogram with 4 right angles
Square
a parallelogram with
4 congruent sides
AND 4 right angles
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Congruent
Sym metrical
the same size and shape.
Translation
when 2 halves are
mirror images
of each other.
Reflection
slide the object
Rotation
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