**Things to remember...**

- Area of a rectangle = length × breadth
- Area of the square = side × side

**Question 1. Find the areas of the rectangles whose sides are :**

(a) 3 cm and 4 cm

(b) 12 m and 21 m

(c) 2 km and 3 km

(d) 2 m and 70 cm

- Area of a rectangle = length × breadth
- Area of the square = side × side

(a) 3 cm and 4 cm

(b) 12 m and 21 m

(c) 2 km and 3 km

(d) 2 m and 70 cm

- The amount of surface enclosed by a closed figure is called its area.
- Surface Area of a figure can be broken into exact numbers or approximate numbers of square units
- Depending upon the figure, some of square units may be completely covered, or partially covered.
- While using a squared paper, to calculate the area of a figure , we may use the conventions :

- Perimeter is the distance covered once along the boundary of a closed figure .
- Perimeter of a rectangle = 2 × (length + breadth)
- Perimeter of a square = 4 × length of a side
- Perimeter of an equilateral triangle = 3 × length of a side

(Take gravity due to earth 'g'=10 m s

(a) 160 Joules

(b) 320 Joules

(c) 380 Joules

(d) 480 Joules

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