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SUB-TOPIC FOUR
(a) Scale and its uses
(b) Construction of scale: (i) Plain scale (ii) diagonal scale.
SCALE AND ITS USES
Scales are used for enlargement and reduction. A scale is used when an object is too large or too small to be recognized on paper.
Scales are represented in various ways such as:
This representative fraction implies:
There are two types of Scales:
EVALUATION:
Sub-Topic 2: Construction of scale
Construction of plain scale
Activity 1: To construct a plain scale of 1:40mm to read up to 4meters
Procedure:
Activity 1: To construct a plain scale of 1:50mm to read up to 3meters and to indicate the distance 2.6m.
Procedure:
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