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Cross Sections of ThreeDimensional Figures
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3-Dimensional figures can be cut by planes. When
you cut a 3-D figure by a plane, the result is a 2-D
figure.
The cross-sections of 3-D figures are 2 dimensional
figures you are familiar with.
Look at the example on the next page to help your
understanding.
A horizontal cross-section of a cone is a circle.
Can you describe a vertical cross-section of a cone?
A vertical cross-section of a cone is a triangle.
A water tower is built in the shape of a cylinder.
How does the horizontal cross-section compare to the
vertical cross-section?
The horizontal cross-section is a circle.
The vertical cross-section is a rectangle
9
Which figure has the same horizontal and
vertical cross-sections?
A
C
B
D
10 Which figure does not have a triangle as one
of its cross-sections?
A
C
B
D
11
Which is the vertical cross-section of the
figure shown?
A
B
Triangle
Circle
C
Square
D
Trapezoid
12 Which is the horizontal cross-section of the
figure shown?
A
B
Triangle
Circle
C
Square
D
Trapezoid
13 Which is the vertical cross-section of the
figure shown?
A
B
Triangle
Circle
C
Square
D
Trapezoid