Home > Algebra > Formulas for Problem Solving

How do you find the circumference and the area of a circle with diameter 6m?

Answer 1

Area of circle = #pir^2# or #pi (d/2)^2#
Circumference of circle = #pid#
For a circle with diameter #6#m this becomes #A~=28.27m^2# and #C~=18.85m#

The constant #pi ~=3.14159# is the ratio of the circumference of a circle to its diameter (or equivalently to twice it's radius).

#C=pid = pi2r#

That same value, #pi#, is also the ratio of the the area of a circle to the square of its radius

#A=pir^2#

Plugging the given diameter (or diameter divided by 2 for the radius) into these equations gives the required results.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Abigail Allen

To find the circumference of a circle, you use the formula: C = π * d, where d is the diameter. So, for a circle with diameter 6m, the circumference would be C = π * 6m. To find the area of a circle, you use the formula: A = π * r^2, where r is the radius. Since radius is half the diameter, for a circle with diameter 6m, the radius would be 3m. So, the area would be A = π * (3m)^2.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.