Question

* Find area of a rectangle which has the following dimensions
(a) 18 cm by 10 cm (b) 25 m by 12 m
(c) 1.2 m by 0.8 m
Find the area of a square whose side length equals
(d) cm
(b) 18 cm
(c) 1.5 m
8. Find in hectares the area of a
(a) rectangular farm measuring 400 m by 275 m.
(b) square farm having one side = 650 m
Find the length of a rectangle whose
(a) area = 360 cm- and breadth = 15 cm
(b) area = 4,5 m- and breadth = 1.8 m
5. Find the perimeter of a square whose area is
(a) 49 cm
(b) 100 cm
(c) 2.56 m
16. (a) Find the area of a square whose perimeter is 84 cm.
(b) The perimeter of a square field is 6 km. Find its area in hectares.
7. Mr Saxena bought a plot of land 80 m by 40 m at 50000 per m2. How much did the plot cost him?
8. How many tiles, each 25 cm by 20 cm, are required for the floor of a room, 12 m long and 9 m wide?
9. How many handkerchiefs, each 35 cm square, can be cut from material 70 cm wide and 3.5 m long?
20. A living room floor measures 6 m by 9 m. A 4 m by 7 m rug is placed on the floor. How many square metres
of the floor are not covered by the rug?
11. The figure shown is composed of two squares. The area of the shaded region is
-56 sq om
56 sq cm. What is the side length of the larger square, if the side length of the small
square is 13 cm?
236​

Answer 1

Answer:

area of rectangle - l*b

a) 18*20

360cm square

Answer 2

Answer:

See below

Step-by-step explanation:

The area of a rectangle is given as the product of its length and width

a) 18 cm by 10 cm

A= 18 x 10 = 180cm^2

b)25 m by 12 m

A= 25 x 12 = 300 m^2

c)1.2 m by 0.8 m

A= 1.2 x 0.8 = 0.96 m^2

The area of a square is the square of its length

(b) 18 cm

A= 18 x 18 = 324 cm^2

(c) 1.5 m

A= 1.5^2 = 2.25 m^2

8. Find in hectares the area of a

(a) rectangular farm measuring 400 m by 275 m.

A= 400 x 275

 = 110,000 m^2

But 1 Ha = 10000m^2

Therefore

A= 110000/10000= 11 Ha

 

(b) square farm having one side = 650 m

A= 650 x 650= 422500 m^2

422500/10000= 42.25 Ha

Find the length of a rectangle whose

(a) area = 360 cm- and breadth = 15 cm

A= L x W

L= A/ W

L= 360/15 = 24 cm

(b) area = 4,5 m- and breadth = 1.8 m

A= L x W

L= A/W

L= 4.5/1.8 = 2.5 m

16. (a) Find the area of a square whose perimeter is 84 cm.

P= L x4

L= P/4

L= 84/4 =21cm

A= L x L= 21^2= 441 cm^2