Area of a circle

1. How do we calculate the area of a circle?
2. How do you find area with diameter?
3. What is 2 pi r squared?
4. How do you find the circumference and area of a circle?

How do we calculate the area of a circle?

The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.

How do you find area with diameter?

The formula for the area A as a function of the diameter d of a circle is given by A = π (d/2)^2.

What is 2 pi r squared?

The formula for the total surface area of cylinder is SA = 2(pi)(radius squared) + 2(pi)rh, where r is the radius and h is the height. A particular solid right cylinder of radius 2 feet has a total surface area of 12pi square feet.

How do you find the circumference and area of a circle?

Divide the area by pi; that gives you r ². Find the square root; that gives you r. Double it; that gives you the diameter. Multiply by pi; that gives you the circumference.