Question

38.5 cm diameter= ? circumference

Answer 1

circumference=πd=22/7×38.5

=22×5.5=121cm

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Answer 2

$\large{\textsf{Question :-}}$

If diameter of a circle is 38.5 cm, then find the circumference.

$\large{\textsf{Answer :-}}$

$\underline{\text{Given}}$:- Diameter = 38.5 cm ;

Radius = $\dfrac{38.5}{2}$ = 19.25 cm

$\underline{\text{To Find}}$ :- Circumference of circle

We know that,

Circumference of circle = 2πr

$\implies$ 2 × $\dfrac{22}{7}$ × 19.25

$\implies$ $\dfrac{847}{7}$

$\implies$ 121 cm

$\textsf{\underline{\text{So, the circumference of circle is 121 cm.}}}$

$\bf{\underline{\text{Extra Info}}}$

Circumference of circle means the perimeter of circle where r stands for radius, d stands for diameter. The value of π is 22/7 but sometimes we use 3.14 as the value of π if it is given in question. The formula to find it's are is πr².