## What is the circumference of a radius of 9?

Example
Problem Find the circumference of the circle.
Answer The circumference is 9 or approximately 28.26 inches.

## What is the radius of a circle with a given area?

Given the area of a circle calculate the radius, circumference and diameter. Putting r, C and d in terms of A the equations are: r=√Aπ C=2πr=2π√Aπ d=2r=2√Aπ

25.14 inches

## What is the radius of a circle with 4cm?

What is the area of a circle with radius 4 cm?

Result: The area of a circle with radius 4 is 50.27
Formulae:
r = 4 d = 8 C = 25.1 A = πr2 = π(d2)2 A = C24π π = 3.1415 A = area C = circumference or perimeter r = radius, d = diameter

## What is the area of a 6 cm circle?

What is the area of a circle with diameter 6 cm?

Result: The area of a circle with diameter 6 is 28.27
Formulae:
r = 3 d = 6 C = 18.9 A = πr2 = π(d2)2 A = C24π π = 3.1415 A = area C = circumference or perimeter r = radius, d = diameter

## What is the radius of a 6ft circle?

What is the area of a circle with a DIAMETER of 6 feet (radius of 3 feet)? How big is a 6 foot circle?…Area of a 6 Foot Circle.

28.274 square feet
26,268 square centimeters

## What numbers are similar to pi?

Yes, there’s a number called ‘e’, but it’s also known as Euler’s Number. Like pi, it’s an important mathematical constant, an irrational number that goes like this: 2.71828182845904523536… Mathematicians have calculated e to over a trillion digits of accuracy.