Page 205 - Start Up Mathematics_6

area of floor
Number of tiles =
area of each tile
42
= = 168 tiles
0.25
Cost of 1 tile = ` 60
∴ Total cost of tiles = 168 × 60 = ` 10,080

EXERCISE 10.2

1. Find the area of a rectangle whose length is 25 m and breadth 16 m.
2. Find the area of a square of side 36 cm.
3. The area of a playground is 1,547 sq. m. Its breadth is 17 m. What is the length of the
playground?

4. A rectangle and a square are equal in area. The side of the square is 24 m. If the length of
the rectangle is 36 m, find the breadth of the rectangle. Comment on their perimeters.
5. A drawing room is 5 m 40 cm long and 4 m 10 cm wide. How much carpet is required to
cover the drawing room? What will be the cost of the carpet, if 1 sq m of carpet costs ` 325?
6. Find the cost of leveling a ground at the rate of ` 12 per square metre if it is 45 m long and
30 m wide.

7. Find the cost of fencing a rectangular field 34 m 20 cm long and 16 m 30 cm wide at ` 40
per metre. What will be the cost of turfing it at ` 21 per square metre?
8. What happens to the area of a square, if its side is doubled?
9. A stick, assumed to be 1 m long, measured the side of a square field. The area thus calculated
was 625 square metre. Later on, it was discovered that the actual length of the stick is 90
cm. Find the actual area of the square field.
10. How many tiles whose length and breadth are 12 cm and 5 cm respectively will be needed
to fit in a rectangular region whose length and breadth are respectively:

(a) 200 cm and 144 cm (b) 80 cm and 48 cm
11. Four square flower beds each of side 1 m are dug on a piece of land 7 m long and 5 m
wide. What is the area of the remaining part of the land?

MATHS LAB ACTIVITY

Finding area of the rectilinear figure using a dot paper or geoboard

The area of the given polygon can be found by dividing it into
smaller parts.

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