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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

User Alan John
by
7.9k points

2 Answers

7 votes

Answer:

B) 4 units

Explanation:

Edge 2020

User Al Hennessey
by
7.8k points
4 votes

Answer:

Option B.

Explanation:

The given equation is


(x+5)^2+(y-3)^2=4^2 ...(1)

The standard form of a circle is


(x-h)^2+(y-k)^2=r^2 ...(2)

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

On comparing (1) and (2) we get


h=-5,k=3,r=4

It means center of the circle is (-5,3) and radius of the circle is 4 units.

Therefore, the correct option is B.

User NRitH
by
8.4k points

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