So the labour cost for 12 sq m will be = 12 × 25 = 300 If the labour charges are ₹ 25 per sq m, what is the cost of labour for painting this wall?įirst let us calculate the area of the wall to be painted.Īrea of the wall = length of the wall × breadth of the wall = 4 × 3 = 12 Therefore, the area of the rectangle is 300 sq cm.Įxample (2) A wall that is 4 m long and 3 m wide has to be painted. The advantage of a formula is that you can calculate the area simply by substituting the appropriate values.Įxample (1) What is the area of a rectangle of length 20 cm and width 15 cm? It is not necessary to divide a square or rectangle into small squares every time you calculate their area. Therefore, The area of a square = length of a side × length of a side (2) Measure the area of a square with side 5 cm, in the same way. The product of two sides of the square is 3 × 3 = 9. The length of each side of the square is 3 cm. Here, there are 3 rows with 3 squares each, i.e., there are 3 × 3 = 9 squares. Therefore, the area of this square is 9 sq cm. 9 squares of 1 cm each are formed within this square. Therefore, The area of a rectangle = length × breadth Note that here too, the number of squares formed are the same as the product of the length and width of the rectangle. (2) In the rectangle with sides 4 cm and 2 cm, make squares of 1 sq cm each as shown above. Here, the length of the figure is 5 cm and its breadth is 3 cm. Therefore, the area of rectangle ABCD is 15 sq cm. The number of squares in rectangle ABCD is 3 × 5 = 15. In ABCD, 3 rows with 5 squares each have been created. Therefore, the area of each square is 1 sq cm. The length of the sides of each square thus created is 1cm. The points on opposite sides were joined as shown in the figure. (1) In the rectangle ABCD given alongside, 1 cm divisions were marked off on each side. To measure the areas oftalukas or districts, a square with side 1km, or 1sq km is the standard unit used. To measure large areas like fields, parks and playgrounds, a square with side 1 m, that is, an area of 1 sq m, is taken as the standard unit. That is why this unit is written as sq cm, in short. The area of this square is 1 square centimetre. For this, a square with a side 1 cm is taken as the standard unit. In order to measure area, we need a standard unit of area. Teacher : Centimetre is a standard unit of length. In the same way, count the squares in each figure and write its area.Ītul : Sir, why is the unit for area written as sq cm? We measure the sides in centimetres. Of the figures given above, figure ABCD has six squares of 1 cm each inside it. Write the perimeter of each in the right box. Measure their sides with the help of the lines on the graph paper. Look at the figures on the sheet of graph paper. The sides of a triangle are 24.7cm, 20.4 cm and 10.5 cm respectively. If the field is 60 m long and 40 m wide, how much wire will be needed? How many metres did he run altogether?įour rounds of wire fence have to be put around a field. One player took 5 rounds around the playground. Each side of the playground is 20 m long. ∴ The total cost of the wire needed for the fence is ₹ 28,800Ī game requires its players to run around a square playground. If the wire costs 60 rupees permetre, what will be the total cost of the wire needed for the fence? A triple fence has to be put along its edges. The length of a rectangular plot of land is 50 m and its width is 30 m. So, in one round the distance can be covered is 480 m, hence in 12 rounds the distance can be covered is If one side of the park is 120 m, find out in kilometres and metres the distance that Sanju covers daily. Sanju completes 12 rounds around a square park every day. ∴ The distance walked in 4 rounds is 2 km In one round distance walked is 500 m, hence, distance walked in 4 rounds If we take 4 rounds around a field that is 160 m long and 90 m wide, what is the distance we walk in kilometres? If the length of a rectangle is 20 m and its width is 12m, what is its perimeter?Įach side of a square is 9 m long. ∴ 22 cm wire will be needed to make a rectangle How much wire will be needed to make a rectangle 7 cm long and 4 cm wide? Maharashtra State Board Class 5 Maths Solutions Chapter 12 Perimeter and Area Problem Set 49 Balbharti Maharashtra Board Class 5 Maths Solutions Chapter 12 Perimeter and Area Problem Set 49 Textbook Exercise Important Questions and Answers.
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