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Find the length of the boundary of square D. 8 squares of side 1 cm are cut out of the square D. Now it looks like shape E. What is the length of the b - Mathematics

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Sum
  1. Find the length of the boundary of square D.
  2. 8 squares of side 1 cm are cut out of the square D. Now it looks like shape E. What is the length of the boundary of shape E?
     
  3. The boundary of this    is ______ + ______ + ______ + ______
    Can we also say that the boundary is 4 × 1 cm?
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Solution

  1. The boundary of shape D = 5 cm + 5 cm + 5 cm + 5 cm = 20 cm
  2. There are 21 edges measuring 1 cm of shape ‘E’.
    Hence, the boundary of shape ‘E’ = 1 cm x 21 = 21 cm
  3. The boundary    = 1 cm + 1 cm + 1 cm + 1 cm = 4 cm
    So, we can say the boundary of  = 4 × 1 cm.
Concept: Fields and Fences
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APPEARS IN

NCERT Mathematics - Math - Magic Class 4 CBSE
Chapter 13 Fields and Fences
Q 2. | Page 155
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