what is the circumference of a circle with a radius of 2.1 estimate the area to the hundredths place using 3.14
The formula for the circumference of a circle is C = 2πr, where r is the radius. Given that the radius is 2.1, the circumference can be calculated as:
C = 2π * 2.1
C ≈ 13.194
Therefore, the circumference of a circle with a radius of 2.1 is approximately 13.194 units.
To estimate the area of the circle using 3.14 as an approximation for π, we can use the formula A = πr^2. Substituting in the given radius:
A = 3.14 * (2.1)^2
A ≈ 13.854
Rounding to the hundredths place, the area of the circle is approximately 13.85 square units.
To find the circumference of a circle, you can use the formula:
Circumference = 2 * π * radius
Given that the radius of the circle is 2.1, we can substitute this value into the formula:
Circumference = 2 * 3.14 * 2.1
Simplifying the equation, we have:
Circumference = 6.28 * 2.1
Circumference = 13.188
So, the circumference of the circle with a radius of 2.1 is approximately 13.188.
To estimate the area of the circle, we can use the formula:
Area = π * radius^2
Substituting the radius (2.1) and the value of π (3.14) into the formula:
Area = 3.14 * (2.1)^2
Area = 3.14 * 4.41
Area = 13.8174
Rounding to the hundredths place, the estimated area of the circle is approximately 13.82.
To find the circumference of a circle, you can use the formula:
Circumference = 2 * π * radius
Given that the radius is 2.1, and using an approximation for π as 3.14, we can substitute these values into the formula:
Circumference = 2 * 3.14 * 2.1
Calculating this, we get:
Circumference ≈ 13.188
Therefore, the circumference of the circle with a radius of 2.1, considering π as approximately 3.14, is approximately 13.188.
Now, moving on to estimating the area of the circle using the same value of π:
The formula to find the area of a circle is:
Area = π * radius^2
Substituting the value of the radius (2.1) and approximating π as 3.14, we can calculate the area:
Area = 3.14 * 2.1^2
Simplifying this further, we have:
Area ≈ 3.14 * 4.41
Calculating this, we get:
Area ≈ 13.8414
Rounding to the hundredths place, the estimated area of the circle with a radius of 2.1, using π as approximately 3.14, is approximately 13.84.