Students can download 5th Maths Term 3 Chapter 1 Geometry Ex 1.2 Questions and Answers, Notes, Samacheer Kalvi 5th Maths Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

## Tamilnadu Samacheer Kalvi 5th Maths Solutions Term 3 Chapter 1 Geometry Ex 1.2

Question 1.

The length of the side of each square is given below. Find its area.

(i) 10 metres

(ii) 5 cm

(iii) 15 metres

(iv) 16 cm

Answer:

(i) 10 metres

Area of the square = Length of a side × length of side

= 10 × 10 = 100 sq.m

(ii) 5 cm

Area of the square = Length of a side × length of side

= 5 × 5 = 25 sq.cm

(iii) 15 metres

Area of the square = Length of a side × length of side

= 15 ×15 = 225 sq.m

(iv) 16 cm

Area of the square = Length of a side × length of side

= 16 × 16 = 256 sq.cm

Question 2.

Find the area of the following rectangles.

(i) length = 6 cm and breadth = 3 cm

(ii) length = 7 in and breadth = 4

(iii) length = 8 cm and breadth = 5 cm

(iv) length = 9 m and breadth = 6 m

Answer:

(i) length = 6 cm and breadth = 3 cm

Area of the rectangle = Length × breadth

= 6 cm × 3 cm = 18cm ^{2}

(ii) length = 7 in and breadth = 4

Area of the rectangle = Length × breadth

= 7 cm × 4 cm = 28 cm ^{2}

(iii) length = 8 cm and breadth = 5 cm

Area of the rectangle = Length × breadth

= 8 cm × 5 cm = 40 cm ^{2}

(iv) length = 9 m and breadth = 6 m

Area of the rectangle = Length × breadth

= 9 m × 6m = 54 m ^{2}

Question 3.

If the cost of 1 sq.m of a plot is ₹ 800, then find the total cost of the plot that is 15 m long and 10 m breadth.

Answer:

Area of plot = length × breadth 15 × 10 = 150 sq.m

Cost of 1 sq.m of a plot of land = 800 rupees

Cost of a plot of land = 150 × 800 = 1,20,000 rupees.

Question 4.

The side of a square is 6 cm. The length of a rectangle is 10 cm and its breadth is 4 cm. Find the perimeter and area of both the square and rectangle.

Answer:

Perimeter of a square = 4 × length of a side = 4 × 6 cm: 24 cm

Area of a square = length of a side × length of a side

= 6 × 6 = 36cm^{2}

Perimeter of a rectangle = 2 × length + 2 × breadth

= 2 × 10 + 2 × 4

= 20 + 8 = 28cm

Area of a rectangle = length × breadth

= 10 × 4 = 40 cm^{2}

Question 5.

What will be the labour cost of laying the floor of an assembly hall which is 14 m long and 10 m breadth if the cost of laying is 60 per sq.m?

Answer:

Area of a rectangle = length × breadth

= 14 × 10 = 140 cm^{2}

Cost of laying 1 sq.m = 60 rupees

Cost of laying the floor = 140 × 60 = 8400 rupees