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 (2-dimensional).
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 3-dimensional
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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