Question

if perimeter of circle is 18cm then what is radius​

Answer 1

perimeter of circle =2 pie r

18=2×22/7×r

18/2=22/7×r

9-22/7=r

r=-41/7

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Answer 2

$\huge\underline\mathfrak\blue{Answer-}$

Radius of the circle is 2.867 cm.

$\huge\underline\mathfrak\blue{Explanation-}$

Given : perimeter of circle is 18cm.

To find : Radius of circle.

Solution :

Let r be the Radius of circle.

We know that,

perimeter of circle = circumference of circle.

Also,

Circumference of circle = 2πr

$\therefore$ 2πr = 18

Taking π = $\dfrac{22}{7}$

2 × $\dfrac{22}{7}$ × r = 18

r = $\dfrac{18×7}{22×2}$

r = $\dfrac{126}{44}$

r = 2.867 cm

Therefore, Radius of the circle is 2.867 cm.