The formula because that the circumference of a circle is C=2∏r, in i beg your pardon r=radius. To discover the radius, then, us insert 18 in for the circumference. Therefore 18=2∏r. Solving for r provides 9/∏, or roughly 2.86 inches.

You are watching: Area of a 18 inch circle

Now the we have actually the radius, us can uncover the area. The formula because that the area the a one is A=∏r2. For this reason inserting 9/∏ because that r gives us A=∏(9/∏)2. Then A=∏(81/∏2). Simplifying provides A=81/∏, or roughly 25.78 inches.

Hey Amanda -- sorry around the so late answer!

Circumference (C) is "the walk-around": C is about 3x diameter or 6x radius (adjust by5%to it is in closer) ... Foryour example, radius (r)is C/6 or 3" (subtract 5% or 0.15 to gain 2.85").

For Area (A), an initial visualize a square: radius (r) would be half a next ... Area ofsquare is 2r*2r or 4r*r ... Next, visualize a square-shaped diamond within the 1st box -- diamond corners touching North, South, East, West. Area of within diamond is 1/2 the outer box or 2r*r ... Finally, attract acircle poignant the inside edges of the 1st outer crate ... The one area is in between the external box area 4r*r and the inner diamond area of2r*r ... One area would be 3r*r or 3*3*3 or27 sq.in. (subtract 5% or 1.35 to get 25.65 sq.in.)

CIRCLE SUMMARY: "Walk-around" (C)is 3x the "walk-across" or 6x the radius (add 5% pointer for closer C) ... Area is 3x radius squared or 3/4 of the diameter squared (add a 5% pointer for closer Area)

Best wishes, ma"am :)

rise • 0 Downvote
More
Report

## Still in search of help? acquire the right answer, fast.

asking a inquiry for totally free

gain a free answer come a rapid problem. Many questions answered in ~ 4 hours.

OR
uncover an virtual Tutor now

pick an expert and meet online. No packages or subscriptions, pay only for the time you need.

¢ € £ ¥ ‰ µ · • § ¶ ß ‹ › « » > ≤ ≥ – — ¯ ‾ ¤ ¦ ¨ ¡ ¿ ˆ ˜ ° − ± ÷ ⁄ × ƒ ∫ ∑ ∞ √ ∼ ≅ ≈ ≠ ≡ ∈ ∉ ∋ ∏ ∧ ∨ ¬ ∩ ∪ ∂ ∀ ∃ ∅ ∇ ∗ ∝ ∠ ´ ¸ ª º † ‡ À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï Ð Ñ Ò Ó Ô Õ Ö Ø Œ Š Ù Ú Û Ü Ý Ÿ Þ à á â ã ä å æ ç è é ê ë ì í î ï ð ñ ò ó ô õ ö ø œ š ù ú û ü ý þ ÿ Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ ς σ τ υ φ χ ψ ω ℵ ϖ ℜ ϒ ℘ ℑ ← ↑ → ↓ ↔ ↵ ⇐ ⇑ ⇒ ⇓ ⇔ ∴ ⊂ ⊃ ⊄ ⊆ ⊇ ⊕ ⊗ ⊥ ⋅ ⌈ ⌉ ⌊ ⌋ 〈 〉 ◊

### RELATED TOPICS

math Algebra 1 Algebra 2 Algebra Word problem Algebra concern Word difficulties Algebra assist College Algebra Algebra Equation ... Math aid Math Equations High School: math Math Word trouble Algebra 2 concern Algebra 1 Word problem Math help For college Algebra 2 help College Algebra Word problem Word Problem assist

### RELATED QUESTIONS

uncover two number such the 6 time the first added come 5 time the second equals -9, and 5 times the very first added to 8 time the second equals 4.

word trouble

32 plums and peaches bought because that \$52. Plums price \$2, peaches cost \$1. How numerous plums to be bought

require an applications of linear Equation

Iam x years old & 3times my age 4 years back is 27 year , how old Iam . Please solve it because that me

George P.

5.0 (1,735)

Larry S.

5 (579)

Jeffrey N.

5.0 (118)
See more tutors

### discover an digital tutor

A link to the application was sent to her phone.

See more: Enrique Iglesias In How I Met Your Mother ' Guest Stars, Enrique Iglesias In How I Met Your Mother

Please carry out a precious phone number.
obtain to recognize us
discover with us
occupational with united state