Transcript Geometry Vocabulary

Let’s Review:
Geometry
Mrs. Horne
4th Grade
Niwot Elementary
It’s important to
recognize & name
geometric shapes.
It’s all about
VOCABULARY!
Let’s get started.
Here are some
common shapes
you may already recognize.
Square,
Rectangle,
Triangle,
Circle.
Got it!
But that’s jumping ahead.
Let’s start with the
building blocks of shapes.
In everyday language,
we call these lines.
In geometry, a line has
no beginning and no end.
Here’s an example of a line
Lines
extend infinitely
in
BOTH
DIRECTIONS.
A ray has a starting point
and then extends infinitely
in one direction.
Later!
A line segment has a starting point
and an end point.
You use the points
to name the line
segment.
This is
line segment AB,
and THIS is
line segment
A-present-for-mE!
When lines stay the same distance
apart and never cross or intersect, we
call them parallel lines.
They can be lines, rays,
line segments, or any
combination of these,
AS LONG AS THEY
NEVER INTERSECT
When lines intersect they form angles.
Here are 3 common types of angles.
Acute
Right
or 90 Degree
Obtuse
When lines intersect to form right or 90
degree angles, we call them
perpendicular lines.
Looks like the
“right” angle to me!
Here are some more examples of
perpendicular lines.
Shapes can be created with line segments.
A polygon is any shape
that has 3 or more sides.
Shhh!
I’m
hiding!
Aarrg! I’ve lost me
parrot, but there be
some polly-gones.
A polygon with 3 sides
is called a triangle.
I’ll never
count all
those!
There are several types of triangles.
That’s more
like it.
4-sided shapes are called
quadrilaterals.
“Quad” means 4
“Lateral” means
side, so
quadrilaterals
are shapes with
4 sides.
Makes sense.
Quadrilaterals can be identified further
based on attributes like
the length of each side,
the measurement of the angles,
and whether or not the sides are parallel.
Bring ‘em on!
I’ll attack them
like a lasagna.
They don’t stand
a chance!
Here’s the first shape
4 sides? Check!
Opposite sides parallel? Check!
4 right angles? Check!
All sides the same length? Check!
This is so easy!
It’s a SQUARE.
Here are some more
examples of squares.
Here’s the next shape
4 sides? Check!
Opposite sides parallel? Check!
4 right angles? Check!
All sides the same length? NO!!
But opposite sides are equal
It’s gotta’ be a
RECTANGLE!
Here are some more examples of
rectangles.
Try this one
4 sides? Check!
Opposite sides parallel? Check!
4 right angles? Not Always
But the opposite angles are equal
All sides the same length? Not always
But opposite sides are equal
It must be a
PARALLELOGRAM.
Here are some more examples of
parallelograms.
Here’s another one
4 sides? Check!
Opposite sides parallel? Check!
4 right angles?
NO!! (there’s 1 exception)
But the opposite angles are equal
All sides the same length? Check!
This can only mean one thing.
This is a RHOMBUS
(which, by the way, is a special form
of parallelogram).
Here are some more
examples of rhombi.
Here’s the last one
4 sides? Check!
Opposite sides parallel? NO!!
ONLY 1 pair of opposite sides is parallel
4 right angles? NO!!
But 2 of the angles could be
All sides the same length? NO!!
But the opposite sides that aren’t parallel could be
It’s gotta’ be a
TRAPEZOID.
Here are some more
examples of trapezoids.
It can get confusing,
but this chart can help
So a SQUARE is just a special
rhombus with 90 degree angles.
It’s also a parallelogram because
each pair of opposite sides
is parallel.
And it’s a type of
rectangle because it has
4 right angles and the
opposite sides are
congruent (that’s geometry
talk for exactly the same size
and shape.)
Thanks a lot,
Odie.
Why don’t you
make like a kite
and fly away?
I forgot to
tell you
about
kites.
That’s all, folks!
I hope you liked reviewing
geometry vocabulary!