Page 154 - Maths Class 06

(c) 12 cm (d) 5 cm

5 cm 5 cm
2 cm
5 cm 5 cm 5 cm
6 cm
5 cm 5 cm

4 cm
5 cm 5 cm

5 cm

At a Glance

l The length of the boundary of a closed figure in known as perimeter.

l Perimeter of any closed figure = sum of the lengths of all sides.
l Perimeter of a rectangle = 2 (length + breadth)
l Perimeter of a square = 4 × length of side

l Perimeter of a regular polygon having n sides = n × length of side.
l The amount of surface covered by a closed figure is called its area.

l Area of a rectangle = Length × Breadth
l Area of a square = side × side = (side)²

Multiple Choice Questions

Tick (3) the correct answer:
2
1. The cost of plough ing a field at the rate of ` 4 per m is ` 1024. If the breadth of the field is 8 m,
then its length is:
(a) 12 m (b) 16 m (c) 32 m (d) 64 m
2. If the length of a rectangle is doubled and its breadth is halved then its area:
(a) remains same (b) becomes half
(c) doubles (d) becomes one-fourth

3. While esti mat ing the area of a closed figure, the contri bu tion of 8 squares (1 cm × 1 cm) which
are more than half-filled is:
2
2
(a) 0 cm (b) 4 cm 2 (c) 8 cm (d) 16 cm 2
4. The perimeter of a rectangle of length ‘l’ and breadth ‘b’ is:
(a) l b´ (b) l + b (c) 2(l + ) b (d) none
5. The area of a rectangular garden 50 m long is 300 sq. m. Its width is __________.
(a) 3 m (b) 6 m (c) 8 m (d) 12 m

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