Posts Tagged ‘radius of the circle’

Problem 1120

What is the radius  of the circle

(x + 16)2 + (y – 8)2 = 16 ?

 

Solution:-

 

The radius of a circle is the r-value from the equation (x – h)2 + (y – k)2 = r.

 

The radius of a circle is (4).

 

 

 

Problem 484

 

Write the equation of a circle with a center at (-4, 2) and a radius of 5.

 

Solution:-

 

Use the general formula (x – h)2 + (y – k)2 = r2

 

Where (h , k) center of the circle and r is radius .

 

(x + 4)2 + (y – 2)2 = 25