Question

Arti had brought a circular pot where in area of cross-section is mentioned as 38.5² cm .  She wanted to calculate the radius of the circle and observed its value as –​

Answer 1

Answer:

IT IS 4 CM

Step-by-step explanation:

Answer 2

Answer:

(Note : 38.5² cm should be $\[38.5\,{\rm{c}}{{\rm{m}}^2}\]$.

Solution:

Know that area of a circle $\[ = \pi {r^2}\]$

$\[\therefore \pi {r^2} = 38.5\]$

Put, $\[\pi = \frac{{22}}{7}\]$

$\[ \Rightarrow {r^2} = \frac{{38.5 \times 7}}{{22}}\]$

$\[ \Rightarrow r = \sqrt {12.25} \]$

$\[ \Rightarrow r = 3.5\,{\rm{cm}}\]$

Hence, the radius of the circle is 3.5 cm.