Question

I’m gonna ask this question again can someone help me solve this and leave in terms of pi

Answer 1

Circumference = 10
`\pi`, 19
`\pi`, 30
`\pi`, 16
`\pi`

Area = 25
`\pi`, 90.25
`\pi`, 225
`\pi`, 64
`\pi`

Explanation:

For the first row we have the radius which is 5, the diameter is 10. The formula for circumference is 2
`\pi`r. So for this one its gonna be 2
`\pi`5 or 10
`\pi`

radius = 5

diameter = 10

circumference = 2
`\pi`5 or 10
`\pi`

area =
`\pi`
`5^(2)` or 25
`\pi`

for the second row

radius = 9.5

diameter = 19

circumference = 2
`\pi`9.5 or 19
`\pi`

area =
`\pi`
`9.5^(2)` or 90.25
`\pi`

for the third row

radius = 15

diameter = 30

circumference = 2
`\pi`15 or 30
`\pi`

area =
`\pi`
`15^(2)` or 225
`\pi`

for the fourth row

radius = 8

diameter = 16

circumference = 2
`\pi`8 or 16
`\pi`

area =
`\pi`
`8^(2)` or 64
`\pi`

Answer 2

The equation of the circumference of a circle in terms of
`\pi` is
`2\pi r` or
`\pi d`.

The circumference for a circle with diameter 10 is
`10\pi`.

The circumference for a circle with diameter 19 is
`19\pi`.

The circumference for a circle with diameter 30 is
`30\pi`.

The circumference for a circle with diameter 16 is
`16\pi`.

Relatively easy, right?

The equation of the area of a circle in terms of
`\pi` is
`\pi r^2`.

The area of a circle with radius 5 is
`25\pi`.

The area of a circle with radius 9.5 is
`90.25\pi`.

The area of a circle with radius 15 is
`225\pi`.

The area of a circle with radius 8 is
`64\pi`.

Hope this helped!

(By the way, I don't know why you're using hard formulas for trying to find the radius or diameter. The diameter is simply twice the radius, and the radius is simply half the diameter.)