JSS2 Second Term Mathematics Lesson Note – Scale Drawing

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TOPIC: SCALE DRAWING

Content:

• Scale drawing of plane shapes.
• Application of scale drawing to solve problems
• Maps and drawing.

SCALE DRAWING OF PLANE SHAPES

A scale simply means the dimension or proportion of objects in comparison to its original or actual size after the drawing. It is widely use in sciences especially in Geography, Biology, Mathematics, Physics, etc.

The scale of a drawing is determined by comparing the length of the drawing with the actual length of the object.

Scale = ^{length of the object after drawing}/_{corresponding length of object before drawing}

A is original

B is drawing

Diameter of A  = 25cm                                                           Diameter of B = 10cm

Scale =      the scale is 2 to 5,  i.e  2 : 5 meaning 2cm represents 5cm

CLASS ACTIVITY

Use measurement to find the scale of the following shapes/figures:

APPLICATION OF SCALE DRAWING IN SOLVING PROBLEMS

In scale drawing the materials needed are pencil, ruler and set square. The drawings should be on plane sheets or white papers. The dimensions of the actual object should be written on the drawing and a title has to accompany it. However, a rough sketch must be drawn first.

Example:

1. A measurement of 8000m is drawn to a scale where 1cm represents 500m. Find its length on the drawing.

Solution:

500m is represented by 1cm.

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