Page 192 - Start Up Mathematics_4

6. (a) Find the length of the boundary of square 5 cm
D.

(b) 8 squares of side 1 cm are cut out of the
square D. Now it looks like shape E. What 5 cm 5 cm E
is the length of the boundary of shape E? D

5 cm
1 cm

(c) The boundary of this is _____ + _____ + _____ + _____

Can we also say that the boundary is 4 × 1 cm?

7. Naina was making a circle.
Ravi asked her for an eraser. She kept her compass and gave him the eraser. Then she
started again to complete her circle. But she got this.

Why did Naina get such a drawing? Discuss.

SCRATCH YOUR BRAIN

1. Write the letters of the alphabet which have no line of symmetry.

2. Draw a closed shape around the coloured square such that the given number is the
perimeter of the shape drawn. Each side of the square in the grid is of length 1 cm.

10 14

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