What is the radius of a circle whose equation is (x + 5)2 + (y - 3)2 = 42?
2 units, 4 units, 8 units, 16 units
Solution:
The standard center radius equation of a circle is (x - h)2 + (y - k)2 = r2
Where (h, k) are the coordinates of center and r is the radius of the circle
Given: (x + 5)2 + (y - 3)2 = 42
Comparing it with the standard equation
(h, k) = (-5, 3)
Radius r2 = 42
r = 4 units
Therefore, the radius of the circle is 4 units.
What is the radius of a circle whose equation is (x + 5)2 + (y - 3)2= 42?
Summary:
The radius of a circle whose equation is (x + 5)2 + (y - 3)2 = 42 is 4 units.