Question

the diameter of a circle is 42 cm find its perimeter if the perimeter of the circle is doubled what will be the radius of a new circle
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Answer 1

$1 \frac{222222 {2222 \sqrt{2 \sqrt{5546 \sqrt{2655} } } }^{?} \times \frac{?}{?} }{?} \sqrt{51999} {222.}^{? = = 121}$

Answer 2

Answer:

radius of circle is 21cm

perimeter is 2pi r

=42π

double perimeter will be 84π

new radius will be

$84\pi = 2\pi \: r \\ 2r = 84 \\ r = 24$