Question

The area of circle is 38.5 sq.cm then it's circumference is

(1) 5cm
(2) 22 cm
(3) 14cm
(4) 196cm​

Answer 1

${\underline{\underline{\huge{\mathfrak{\green{Answer:-}}}}}}$

Hey Mate!!

Area of circle = π$r^{2}$

$= > 38.5 = \pi {r}^{2} \\ = > 38.5 = \frac{22}{7} {r}^{2} \\ = > {r}^{2} = 38.5 \times \frac{7}{22} \\ = > {r}^{2} = 1.75 \times 7 \\ = > {r}^{2} = 12.25 \\ = > r = \sqrt{12.25} \\ = > r = 3.5 \: cm$

Circumference of circle = 2πr

$= > 2 \times \frac{22}{7} \times 3.5 \\ = > 2 \times 22 \times 0.5 \\ = > 22 \: cm$

Thus, your answer is (2) 22 cm.

Hope it helps...✌️✌️

Answer 2

Answer:

first multiply 22/7×38.5=121

then do route square of 121 is 11

then we have to find its circumference

so,we have to multiply 2×22/7×11

then it's answer is 69.14

and its is circumference