Question

the area of circular tinplate is 38.5 metre square find its circumference​

Answer 1

Answer:

The circumference of the circular tinplate is 22 m.

Step-by-step explanation:

The area of a circle is: $Area=\pi r^{2}$

Given:

Area = 38.5 m²

Compute the radius as follows:

$Area=\pi r^{2}\\38.5=\frac{22}{7}\times r^{2}\\r^{2}=\frac{38.5\times 7}{22}\\r^{2}=12.25\\r=3.5$

Compute the circumference as follows:

$C=2\pi r\\=2\times \frac{22}{7}\times3..5\\=22$

Thus, the circumference of the circular tinplate is 22 m.