Find the diameter and the circumference of a circle whose area is :A)

1.	Find the diameter and the circumference of a circle whose area is :A) 394.24cm²B) 25pi cm²Plz explain me the answer fast
Answer» GIVEN:- Area of CIRCLE is 394.24 cm². Area of circle is 25 pi cm². ⠀ To find:- Diameter and circumference of a circle. ⠀ Solution:- 1) 394.24 cm² $\large{\tt{\longmapsto{Area = 394.24}}}$ ⠀ $\large{\tt{\longmapsto{\pi r^2 = 394.24}}}$ ⠀ $\large{\tt{\longmapsto{\dfrac{22}{7} \times r^2 = 394.24}}}$ ⠀ $\large{\tt{\longmapsto{r^2 = \dfrac{394.24 \times 7}{22}}}}$ ⠀ $\large{\tt{\longmapsto{r^2 = \dfrac{2759.68}{22}}}}$ ⠀ $\large{\tt{\longmapsto{r^2 = 125.44}}}$ ⠀ $\large{\tt{\longmapsto{r = \sqrt 125.44}}}$ ⠀ $\large{\tt{\longmapsto{r = 11.2}}}$ ⠀ $\large{\tt{\longmapsto{Perimeter = 2 \pi r}}}$ ⠀ $\large{\tt{\longmapsto{2 \times \dfrac{22}{7} \times 11.2}}}$ ⠀ $\large{\tt{\longmapsto{44 \times 1.6}}}$ ⠀ $\large{\tt{\longmapsto{\boxed{\red{70.4}}}}}$ ⠀ Hence, Diameter = 2r = 22.4 CM Perimeter = 70.4 cm ⠀ ⠀ 2) 25 pi cm² $\large{\tt{\longmapsto{Area = 25 \times \pi}}}$ ⠀ $\large{\tt{\longmapsto{\pi r^2 = 25 \times \pi}}}$ ⠀ $\large{\tt{\longmapsto{r^2 = 25}}}$ ⠀ $\large{\tt{\longmapsto{r = \sqrt 25}}}$ ⠀ $\large{\tt{\longmapsto{r = 5}}}$ ⠀ $\large{\tt{\longmapsto{Perimeter = 2 \pi r}}}$ ⠀ $\large{\tt{\longmapsto{2 \times \dfrac{22}{7} \times 5}}}$ ⠀ $\large{\tt{\longmapsto{\dfrac{44}{7} \times 5}}}$ ⠀ $\large{\tt{\longmapsto{\boxed{\red{31.42}}}}}$ ⠀ Hence, Diameter = 2r = 10 cm Perimeter = 31.42 cm