Question

A man wants to paint two of his walls. The cost of painting is Rs. 10 per cm². How much money is required by him to paint a rectangular wall of length 400cm and breadth 900cm and a circular wall of diameter 126cm?​

Answer 1

$\underline\mathfrak{Answer}$

Rs. 3724740

$\underline\mathfrak{Explanation}$

Length of the rectangular wall = 400 cm

Breadth of the rectangular wall = 900 cm

Area = length × breadth

= 400 cm × 900 cm

$= 360000 {cm}^{2}$

Diameter of circular wall = 126 cm

Radius = 126÷2

= 63 cm

Area of the circular wall =

$\pi{r}^{2}$

$= \frac{22}{7} \times 63 \times 63$

= 22 × 9 × 63

$= {12474cm}^{2}$

Total area of the walls = 3,60,000 + 12,474

$= {372474cm}^{2}$

Cost of painting = Rs. 10 per centimetre square.

$= 10 \times 372474$

= Rs. 37,24,740

Therefore, the man requires Rs. 37,24,740

Answer 2

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the man requires Rs. 37,24,740