Question

The diameter of a circular
'cular park is 84 metres. A 3.5 m wide road runs on the outside
3.5 m wide road runs on the outside it. Find the cost of
constructing the road at Rs 30 per square metre ​

Answer 1

Answer:

ans from there are sure conf.. the ans

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Answer 2

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$radius \: of \: a \: circular \: park = ( \frac{84}{2} )m \: = 42m.$

$width \: of \: the \: road \: = 3.5m$

$radius \: of \: the \: outer \: circle = (42 + 3.5)m$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 45.5m \: .$

Area of the road

= ( area of outer road ) - ( area of inner road )

= {π × ( 45.5 )² - π × ( 42 )² } m²

= π × {( 45.5 )² - (42)² } m²

= { π × ( 45.5 + 42 ) × ( 45.5 - 42 )} m²

$= ( \: { \dfrac{22}{7} \times 87.5 \times 3.5)m }^{2}$

$= {962.5 \: m}^{2}$

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