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Describing Prismsand Pyramids
Cliiieic llewiew
> A pyramid has 1 base.The base is a face.A pyramid has some triangular faces.
This pyramid has 6 vertices,10 edges, and 6 faces:- 1 pentagon
s 5 triangles
This pyramid has 4 vertices,6 edges, and 4 faces:e 4 triangles
edge
base
face
vertex
face
vertex
A prism has 2 bases that are the same.
A prism has some rectangular faces.
This prism has 12 vertices,
18 edges, and 8 faces:
• 2 hexagons
• 6 rectangles
edge^
base^\
This prism has 8 vertices,
12 edges, and 6 faces:
• 6 rectangles
IV-vertex face
Tace edge
base
vertex
1. Colour the pyramids blue. Colour the prisms red.
96
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Practice' j
1. Complete the chart.
ObjectPyramid or
Prism?Numberof Faces
Number
of EdgesNumber
of Vertices
h
2. Name each object and the shapes of its faces.
Stretch Your Thinking
Draw the other base and the
faces of the prism with this base:
97
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Quick Be¥iew
ObjectWumber of
VerticesNumber of
EdgesNumber of
Faces
^/\faceCone
1 1 1
face^ ) '¦_ }Cylinder
0 2 2
Sphere
0 0 0
Try These g ® e ® © « ©
1. Tell if each object looks like a cone, a cylinder, or a sphere,
a) b) c)
d)f ««
e) f)
liH ©8IT:
\
ractice l
1. Look at home for an item that looks like each object.
Draw a picture of each item and write its name.Tell how many vertices, edges, and faces the item has.
ItemWumber of
VerticesNumber of
EdgesNumber of
Faces
:ylinder
sphere
cone
2. Pietro says that a cylinder has more faces than edges. Is he correct?
Explain
Think about cylinders, cones, and spheres.Sketch 3 objects that together have:
a) 5 faces and 5 edges b) 1 face and 1 edge
99