Page 1 1. Which of the following are closed curves? Which of them are simple? Solution: The figures (ii), (iii), (iv), (vi) and (vii) are closed curves and the figures (ii), (iii), (iv) and (vi) are simple closed curves. 2. Define perimeter of a closed figure. Solution: The length of the boundary of a closed figure is known as its perimeter. 3. Find the perimeter of each of the following shapes: Solution: We know that perimeter is the sum of lengths of all the sides of a closed figure. (i) Perimeter of the given figure = 4 + 2 + 1 + 5 = 12 cm (ii) Perimeter of the given figure = 23 + 35 + 40 + 35 = 133 cm (iii) Perimeter of the given figure = 15 + 15 + 15 + 15 = 60 cm (iv) Perimeter of the given figure = 3 + 3 + 3 + 3 + 3 = 15 cmRead More

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