3. The scale factor is of: 1 : 360.
The lengths and scale factors are given as follows:
4. Length of 7.5 in and scale factor of 1 : 96.
5. Length of 48 cm and scale factor of 1 : 400
6. Length of 18 in and scale factor of 1 : 9.
What is a scale?
The meaning of the scale of a drawing is how much each unit in the drawing represents in actual distance.
The scale factor is the ratio between the ratio of the dimension of the drawn shape by the actual dimension.
Each feet is composed by 12 inches, hence the scale factor for item 3 is given by:
1/(20 x 12) = 1 : 360.
The lengths for items 4, 5 and 6 are given by the division of the actual length by the measure represented by a single unit, hence:
- Item 6: 13.5/1.5 x 2 = 18 in.
The scale factors are given as follows:
- Item 4: 1/(8 x 12) = 1 : 96.
- Item 5: 1/(4 x 100) = 1 : 400, as each m has 100 cm.
- Item 6: 2/(1.5 x 12) = 2 : 18 = 1 : 9.
Learn more about scales at brainly.com/question/13036238
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