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प्रश्न
The area of a rectangular shaped photo is 820 sq.cm. and its width is 20 cm. What is its length? Also find its perimeter
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उत्तर
Area of a rectangle = (length × breadth) unit2
Here width = 20 cm (breadth)
Area = 820 sq.cm
∴ 820 sq.cm = (length × 20) cm2
Length = `820/20`
= 41 cm
Length of the photo = 41 cm
Perimeter of a rectangle = 2(l + b) units
= 2(41 + 20) cm
= 2 × 61
= 122 cm
Perimeter of the photo = 122 cm
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