Question

Ruglhi draws a hut with a flag. She paints the outline using blue colour.
She wonders what the perimeter of this figure is. Can you help Ragini find
the perimeter?
5
10
5
2. How many tiles whose length and breadth are 13 cm and 7 cm
respectively are needed to cover a rectangular region whose length and
breadth are 520 cm and 140 cm.
3. Mehul has two photo frames. One is square-shaped with a side of 8 cm,
and the other is rectangular with dimensions 10 cm x 4 cm. Mehul only
has a l-m long ribbon. Will he be able to decorate the borders of both the
frames with this ribbon?
4. Maya has a square-shaped garden. She decides to plant roses all along
the boundary, leaving 1m for the gate. The side of the garden is 450 cm.
Find the distance covered by the roses in metres.
5. Sudipta makes a wall hanging. Using triangles, she cuts 3 equilateral
triangles and decorates them. If the sides of the triangles are 5 cm, 6 cm,​

Answer 1

Answer:

The length and the breadth of a rectangular piece of land are 500 m and 300 m respectively. Find

(i) its area

(ii)the cost of the land, if 1 m2 of the land costs Rs 10,000.

ANSWER:

(i) Area = Length × Breadth

= 500 × 300

= 150000 m2

(ii)Cost of 1 m2 land = Rs 10000

Cost of 150000 m2 land = 10000 × 150000 = Rs 1500000000

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Question 2:

Find the area of a square park whose perimeter is 320 m.

ANSWER:

Perimeter = 320 m

4 × Length of the side of park = 320

Length of the side of park =

Area = (Length of the side of park)2 = (80)2 = 6400 m2

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Question 3:

Find the breadth of a rectangular plot of land, if its area is 440 m2 and the length is 22 m. Also find its perimeter.

ANSWER:

Area = Length × Breadth = 440 m2

22 × Breadth = 440

Breadth == 20 m

Perimeter = 2 (Length + Breadth)

= 2 (22 + 20) = 2 (42) = 84 m2

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Question 4:

The perimeter of a rectangular sheet is 100 cm. If the length is 35 cm, find its breadth. Also find the area.

ANSWER:

Perimeter = 2 (Length + Breadth) = 100 cm

2 (35 + Breadth) = 100

35 + B = 50

B = 50 − 35 = 15 cm

Area = Length × Breadth = 35 × 15 = 525 cm2

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Question 5:

The area of a square park is the same as of a rectangular park. If the side of the square park is 60 m and the length of the rectangular park is 90 m, find the breadth of the rectangular park.

ANSWER:

Area of square park = (One of its sides)2 = (60)2 = 3600 m2

Area of rectangular park = Length × Breadth = 3600

90 × Breadth = 3600

Breadth = 40 m