Question

Calculate the area and the circumference of the circle

Answer 1

hope this helps:)

Explanation:

Circumference

The diameter here is 0.4

so divide by two to get the radius

0.4/2 = 0.2

0.2 = r (radius)

so your answer depends on whether you use full (endlessly repeating pi) or partial (3.14) pi

Full pi -

assuming you're using full
`\pi` (pi) for this equation your answer would be 1.2566370614... since circumference =
`r2\pi`

3.14 pi -

assuming you're using 3.14 for pi your answer would then be 1.256 since your using 3.14 instead of full pi.

Area

area =
`\pi r^2`

r (radius) = 0.2

because of PEMDAS exponents are done first (
`r^2`)

`0.2^2` = 0.04

so your answer (again) depends on whether you use full (endlessly repeating pi) or partial (3.14) pi

Full pi -

assuming you're using full pi for this equation your answer would be 0.12566370614... since a =
`\pi r^2`

3.14 pi -

assuming you're using 3.14 for pi your answer would just be 0.1256

Answer 2

Answer given below

Explanation:

r = d/2

r = 0.4/2 = 0.2 inch

Circumference = 2πr

= 2 * 3.14 * 0.2

= 1.26 inches

Area = πr²

= 3.14 * 0.2 * 0.2

= 0.13 in²