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The actual length of a painting was 2 m. What is its length in the photograph if the scale used is 1 mm : 20 cm.

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Question

The actual length of a painting was 2 m. What is its length in the photograph if the scale used is 1 mm : 20 cm.

Sum
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Solution

The actual length of the painting was 2 m or 2 × 100 = 200 cm  ...[∵ 1 m = 100 cm]

Scale used in the painting = 1 mm : 20 cm

Hence, length of painting in photograph = Scale × Actual size  ...`[∵ "Scale" = "Size drawn"/"Actual size"]` 

= `1/20 xx 200`

= 10 mm

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Chapter 6: Visualising Solid Shapes - Exercise [Page 205]

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NCERT Exemplar Mathematics [English] Class 8
Chapter 6 Visualising Solid Shapes
Exercise | Q 100. | Page 205

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