Question

1. find the circumference of the circles whose diameter are :
a. 105 cm
b. 14.7 cm
2. Find the radii of the circles whose circumference are :
a. 15.4 cm
b. 242 cm
c. 30.8 cm
Those who will answer me this question with full explanation I will marks brainliest whose answer is correct but please answer this question I really need it ​

Answer 1

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Step-by-step explanation:

$1). (a)$

$Given, radius , \: r = 105cm$

$Now, Circumference \\ \: of \: Circle = 2πr$

$= 2× \frac{22}{7} ×105 cm$

$= 44×15cm$

$= 660cm$

$(b) \: radius , \: r = 14.7cm$

$= 2× \frac{22}{7} ×14.7cm$

$= 44×2.1 cm$

$= 92.4cm$

$2) Given ,circumference \: of \\ \: \: Circle = 15.4cm$

$let, the \: radius \: of \: the \: circle \: be \: r.$

$now, circumference \: \\ of \: Circle = 2πr$

$= 15.4 = 2× \frac{22}{7} ×r$

$=\frac{15.4 \times 7}{2 \times 22} = r$

$= r = \frac{107.8}{44}$

$(b) Given ,circumference \: of \\ \: \: Circle = 242cm$

$let, the \: radius \: of \: the \: circle \: be \: r.$

$now, circumference \: \\ of \: Circle = 2πr$

$= 242 = 2× \frac{22}{7} ×r$

$=\frac{242\times 7}{2 \times 22} = r$

$= r = \frac{1694}{44}$

$(b) Given ,circumference \: of \\ \: \: Circle = 30.8cm$

$let, the \: radius \: of \: the \: circle \: be \: r.$

$now, circumference \: \\ of \: Circle = 2πr$

$= 30.8 = 2× \frac{22}{7} ×r$

$=\frac{30.8\times 7}{2 \times 22} = r$

$= r = \frac{215.6}{44}$

$please \: like \: my \: answer \\ \&\\ mark \: me \: brainliest \: please \: :)))$

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$\star \: i \: hope \: you \: will \: understand \: me\star$

Answer 2

Step-by-step explanation:

hope it's useful and understandable