Visualising Solid Shapes Worksheet Page 9
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42UNIT-6
Actual distance represented by 6 cm = 6 × 200 km
= 1200 km
So, actual distance between City A and City B is
1200 km.
Example 16 : Height of a building is 9 m and this building is represented
by 9 cm on a map. What is the scale used for the map?
Size drawn
Solution
: Scale of map =
Actual size
9 cm
=
(because 9 m = 900 cm)
900 cm
1
=
100
Thus, scale is 1:100.
Example 17 : The scale on a map is 1 mm : 4 m. Find the distance on
the map for an actual distance of 52 m.
Solution
: Distance on map for an actual distance of 4 m = 1 mm
1
=
´
52
Distance on map for actual distance of 52 m
4
= 13 mm
Thus, distance on map for actual distance of 52 m is
13 mm.
All prisms have two identical, parallel faces. These two faces are always
polygons. A prism’s other faces are always parallelograms.
A prism is sometimes referred to by the shape of the two identical faces on
its ends. For example, a triangular prism has triangular faces on its ends,
and a rectangular prism has rectangular faces on its ends.
Triangular Prism
Rectangular Prism
Example 18 : Application of problem
solving strategy
Determine the number of
edges, vertices and in the
following figure:
V V V V V
S S S S S
S S S S S
179
179
179
179
179
ISUALISING
ISUALISING
OLID
OLID
HAPES
HAPES
ISUALISING
ISUALISING
ISUALISING
OLID
OLID
OLID
HAPES
HAPES
HAPES
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