If a circle's circumference is 15 inches, what is its radius?
Can you explain the steps in solving this formula?
C = pi * d
15 = 3.14 * d
15/3.14 = d
4.77707 = d
4.77707 / 2 = r
2.388535 = r
I still don't understand this.
Please copy and paste the line you don't understand.
C = pi * d
15 = 3.14 * d
15/3.14 = d
4.77707 = d
4.77707 / 2 = r
I apologize, but I do not understand any of them.
Circumference = pi * diameter
Then I substituted real numbers for the letters.
How did you know which numbers to use?
Please memorize pi = 3.154
Your problem stated that the circumference is 15.
thats wrong. pi equals to 3.14 not 3.154 and im in 7th grade and i know this hahah
To find the radius of a circle given its circumference, you can use the formula:
Circumference = 2πr
Where:
Circumference is the distance around the circle,
π (pi) is a mathematical constant approximately equal to 3.14159, and
r is the radius of the circle.
In this case, the given circumference is 15 inches. We can plug this value into the formula:
15 = 2πr
Solving for r, we divide both sides of the equation by 2π:
r = 15 / (2π)
Calculating this, we get:
r ≈ 2.39 inches
Therefore, the radius of the circle is approximately 2.39 inches.