Question

Diameter is 0.9 mm what is area in meter square

Answer 1

Given,

diameter of the circle, d=0.9 mm=0.9×10⁻³ m

The radius is given by,

`r=(d)/(2)`

Therefore the radius of the circle is,

`r=\frac{0.9*10^(-3)^{}}{2}=0.45*10^(-3)\text{ m}`

The area of the circle is given by,

`A=\pi r^2`

On substituting the know values,

`A=3.14*(0.45*10^(-3))^2=6.36*10^(-7)m^2`

Therefore the area of the circle is 6.36×10⁻⁷ m ²