What is the radius of a circle whose equation is open paren x minus 7 close paren squared plus open paren y minus 10 close paren squared is equal to 4 ?
Answer
A
2 units
B
4 units
C
8 units
D
16 units
Explanation
A circle in standard form is (x − h)² + (y − k)² = r², where r is the radius. Here, r² = 4, so r = √4 = 2. The radius is 2 units, choice D.
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