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SOL 3.18
By Ms. Weinberg
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Let’s learn a bit about Geometry!
Geometry is a part of Math that focuses on
shapes and lines.
Shapes
Lines
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Plane Figures are 2-dimensional figures. That
means that they look flat.
Triangle
Circle
Square
Rectangle
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Solid Figures are 3-dimensional figures. That
means that they look like they can stand up on
their own.
cylinder
Rectangular
Solid
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Cube
Let’s take a look at some plane figures (2dimensional).
1
3
4
2
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A square has 4 sides of
equal length.
A rectangle has 4 sides and 4 corners. The 4
corners always make right angles.
A right angle
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A circle is a shape where all points are the
same distance from the center. It does not
have any sides or any corners.
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A triangle is a shape with 3 sides and 3
vertices (points).
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Now let’s learn about 3-dimensional shapes.
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A cube is a 3-dimensional solid with 6
congruent square faces.
edge
a square
Every face in a cube is a square and every
edge is the same length. A cube has 8 corners
and 12 edges.
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A cylinder is a 3-dimensional object formed by
2
Congruent,
Parallel
Circles.
a curved surface
The circles are joined by a curved surface.
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A rectangular solid is a 3-dimensional figure in
which all 6 faces are rectangles.
rectangle
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A sphere is a 3-dimensional object with all of
its points the same distance from the center.
a ball is a sphere
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A cone is a solid, pointed figure that has flat,
round base. The base is usually a circle that is
joined to the point (vertex) by a curved
surface.
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Now you know about 2-dimensional and 3dimensional shapes.
2-dimensional figures are plane figures. They
are flat and “on” the paper.
3-dimensional figures are solid figures. They
look like they could stand up and you could
touch them!
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©A. Weinberg