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FrankyV4387
09.07.2019 •
Mathematics
The radius of the circle whose equation is (x - 3)² + (y + 1)² = 16 is
a). 4
b). 8
c). 16
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Ответ:
The equation of a circle is written as (x-h)^2 + (y-k)^2 = r^2
Where the center point of the circle is (h,k) and r is the radius.
In the given equation 16 = r^2
To find r take the square root of both sides:
r = √16
r = 4
The answer is A.
Ответ:
OPTION A.
Step-by-step explanation:
The equation of a circle in center-radius form is:
Where the center is at the point (h,k) and "r" is the radius.
Then, given the equation of the circle:
You can idenfity that:
Therefore, in order to find the radius, you need to solve for "r".
Then, this is:
Ответ:
just do the math
Step-by-step explanation:
or put please help in the title