Note: if your math problem doesn’t tell you the length of the radius, you might be looking at the wrong section. Check whether the sections for Diameter or Area make more sense for your problem.
Note: if your math problem doesn’t tell you the length of the radius, you might be looking at the wrong section. Check whether the sections for Diameter or Area make more sense for your problem.
Even the π button on a calculator doesn’t use the exact value of π, although it is close enough.
Even the π button on a calculator doesn’t use the exact value of π, although it is close enough.
Even the π button on a calculator doesn’t use the exact value of π, although it is close enough.
C is just a shorter way of writing “circumference. “[5] X Research source
C is just a shorter way of writing “circumference. “[5] X Research source
C is just a shorter way of writing “circumference. “[5] X Research source
You might have written the left side as π2r, which is also correct. People like to move the numbers in front of the symbols just so the equation is easier to read, and this doesn’t change the result of the equation. In a math equation, you can always multiple the left side and the right side by the same amount and still end up with a correct equation.
You might have written the left side as π2r, which is also correct. People like to move the numbers in front of the symbols just so the equation is easier to read, and this doesn’t change the result of the equation. In a math equation, you can always multiple the left side and the right side by the same amount and still end up with a correct equation.
You might have written the left side as π2r, which is also correct. People like to move the numbers in front of the symbols just so the equation is easier to read, and this doesn’t change the result of the equation. In a math equation, you can always multiple the left side and the right side by the same amount and still end up with a correct equation.
You might have written the left side as π2r, which is also correct. People like to move the numbers in front of the symbols just so the equation is easier to read, and this doesn’t change the result of the equation. In a math equation, you can always multiple the left side and the right side by the same amount and still end up with a correct equation.
For example, if the radius is 2 units long, then 2πr = 2 x (3. 14) x (2 units) = 12. 56 units = the circumference. In the same example, but using a calculator’s π button for better accuracy, you’ll get 2 x π x 2 units = 12. 56637. . . units but unless instructed otherwise by your teacher, you can round the number to 12. 57 units.
For example, if the radius is 2 units long, then 2πr = 2 x (3. 14) x (2 units) = 12. 56 units = the circumference. In the same example, but using a calculator’s π button for better accuracy, you’ll get 2 x π x 2 units = 12. 56637. . . units but unless instructed otherwise by your teacher, you can round the number to 12. 57 units.
For example, if the radius is 2 units long, then 2πr = 2 x (3. 14) x (2 units) = 12. 56 units = the circumference. In the same example, but using a calculator’s π button for better accuracy, you’ll get 2 x π x 2 units = 12. 56637. . . units but unless instructed otherwise by your teacher, you can round the number to 12. 57 units.
The line goes through the exact center of the circle, not just anywhere within the circle. Note: If the word problem doesn’t tell you how long the diameter is, use a different method instead.
The line goes through the exact center of the circle, not just anywhere within the circle. Note: If the word problem doesn’t tell you how long the diameter is, use a different method instead.
We’ll be using d, not 2r, since your math problem tells you what d equals. However, it’s important to understand this step, so you aren’t confused if your teacher or math book uses 2r where you would expect a d.
We’ll be using d, not 2r, since your math problem tells you what d equals. However, it’s important to understand this step, so you aren’t confused if your teacher or math book uses 2r where you would expect a d.
We’ll be using d, not 2r, since your math problem tells you what d equals. However, it’s important to understand this step, so you aren’t confused if your teacher or math book uses 2r where you would expect a d.
We’ll be using d, not 2r, since your math problem tells you what d equals. However, it’s important to understand this step, so you aren’t confused if your teacher or math book uses 2r where you would expect a d.
We’ll be using d, not 2r, since your math problem tells you what d equals. However, it’s important to understand this step, so you aren’t confused if your teacher or math book uses 2r where you would expect a d.
Even the π button on a calculator doesn’t use the exact value of π, although it is extremely close.
Even the π button on a calculator doesn’t use the exact value of π, although it is extremely close.
Even the π button on a calculator doesn’t use the exact value of π, although it is extremely close.
π x d = (C / d) x d πd = C
For example, if the diameter was 6 units long, you’ll get (3. 14) x (6 units) = 18. 84 units. In the same example, but using a calculator’s π button for more accuracy, you’ll get π x 6 units = 18. 84956. . . but unless instructed otherwise, you can round the number to 18. 85 units.
Note: If the math problem does not tell you the area of the circle, you may need to use a different method on this page.
Note: If the math problem does not tell you the area of the circle, you may need to use a different method on this page.
Note: If the math problem does not tell you the area of the circle, you may need to use a different method on this page.
Note: If the math problem does not tell you the area of the circle, you may need to use a different method on this page.
A = πr2 A / π = πr2 / π = r2 √(A/π) = √(r2) = r r = √(A/π)
C = 2πr C = 2π(√(A/π))
C = 2πr C = 2π(√(A/π))
C = 2πr C = 2π(√(A/π))
The answer for this example is 13. 72937. . . but unless instructed otherwise you can round to 13. 73.
The answer for this example is 13. 72937. . . but unless instructed otherwise you can round to 13. 73.
The answer for this example is 13. 72937. . . but unless instructed otherwise you can round to 13. 73.
Be careful not to wrap more than once. You should end up with a single loop of string, so there is no part of the circle with two lengths of string next to it.
