Q 17. Avneet buys 9 square paving slabs, each with a side of . He lays them in the form of a square.
(a) What is the perimeter of his arrangement ?
(b) Shari does not like his arrangement. She gets him to lay them out like a cross. What is the perimeter of her arrangement?
(c) Which has greater perimeter?
(d) Avneet wonders if there is a way of getting an even greater perimeter. Can you find a way of doing this?
Q 16. What is the perimeter of each of the following figures? What do you infer from the answers?
Q 15. Sweety runs around a square park of side 75 m. Bulbul runs around a rectangular park with length 60 m and breadth 45 m. Who covers less distance?
Q 14. Find the cost of fencing a rectangular park of length 175 m and breadth 125 m at the rate of rupees 12 per metre.
Q 13. Find the cost of fencing a square park of side 250 m at the rate of rupees 20 per metre.
Q 12. Two sides of a triangle are 12 cm and 14 cm. The perimeter of the triangle is 36 cm. What is its third side?
Q 11. A piece of string is 30 cm long. What will be the length of each side if the string is used to form :
(a) a square? (b) an equilateral triangle? (c) a regular hexagon?
Q 10. The perimeter of a regular pentagon is 100 cm. How long is its each side?
Q 9. Find the side of the square whose perimeter is 20 m.
Q 8. Find the perimeter of a regular hexagon with each side measuring 8 m.
Q 7. Find the perimeter of a triangle with sides measuring 10 cm, 14 cm and 15 cm.
Q 6. Find the perimeter of each of the following shapes :
(a) A triangle of sides 3 cm, 4 cm and 5 cm.
(b) An equilateral triangle of side 9 cm.
(c) An isosceles triangle with equal sides 8 cm each and third side 6 cm.
Q 5. A rectangular piece of land measures 0.7 km by 0.5 km. Each side is to be fenced with 4 rows of wires. What is the length of the wire needed?
Q 4. What is the length of the wooden strip required to frame a photograph of length and breadth 32 cm and 21 cm respectively?
Q 3. A table-top measures 2 m 25 cm by 1 m 50 cm. What is the perimeter of the table-top?
Q 2. The lid of a rectangular box of sides 40 cm by 10 cm is sealed all round with tape. What is the length of the tape required?
Q 1. Find the perimeter of each of the following figures :