Question

the difference between the area and square of radius of a cicle is 105cm what will be the circumference of the circle

Answer 1

=> πr² - r² = 105 ___[Given]

=> r²(π - 1) = 105

$= > {r}^{2} = \frac{105}{\pi - 1} \\ \\ = > {r}^{2} = \frac{105}{ \frac{22}{7} - 1} \\ \\ = > {r}^{2} = \frac{105 \times 7}{22 - 7} \\ \\ = > {r}^{2} = \frac{105 \times 7}{15} = 7 \times 7 \\ \\ = > r = 7 \: cm$
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» Hence the circumference of circle :-

=> 2πr

=> 2×22/7×7

=> 44 cm
________[ANSWER]

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Answer 2

Answer-:

Given that

πr^2-r^2= 105

r^2(π-1) =105

=> r^2= 105/π-1

=> r^2= 105/22/7-1

=> r^2= 105/ 22-7/7

=> r^2= 105/15/7

=> r^2=105×7/15

=> r^2= 7×7=49

=> r= √49= 7cm

now circumstance of the circle= 2πr

2×22/7×7

=> 2×22

=> 44cm
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