Write the equation of a circle with center (4,5) and a circumference = 16 pi

The required equation in standard form is

Step-by-step explanation:

The equation of a circle with center (h,k) an radius, r units is given by the formula;

The given circle has center (4,5) and the radius can be calculated from the given circumference, which is

We substitute these values into the formula to obtain;

We simplify to get;

Equation of the circle : (x - 4)² + (y - 5)² = 64

Step-by-step explanation:

Equation of the circle

(x - x₁)² + (y - y₁)² = r²

Where (x₁, y₁) be the coordinates of center and r is the radius of circle.

To find the radius

It is given that circumference of circle = 16π

Circumference 2πr = 16

r = 16π/2π= 8

To find the equation of the circle

Center = (4, 5)

(x - x₁)² + (y - y₁)² = r²

(x - 4)² + (y - 5)² = 8²

(x - 4)² + (y - 5)² = 64

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared