Question
A circle in the xy‑plane has equation (x + 3)2 + (y – 1)2 = 25. Which of the following
points does NOT lie in the interior of the circle?
- (−7, 3)
- (−3, 1)
- ( 0, 0 )
- ( 3 , 2)
The correct answer is: ( 3 , 2)
HINT – See which points hold the inequality (x + 3)2 + (y – 1)2 > 25
SOLUTION – Since we asked to find out point which does not lie in the interior of the circle i.e. the point that lie outside the circle
(x + 3)2 + (y – 1)2 > 25
For A , put x = -7 , y = 3
We get, (- 7 + 3)2 + (3 – 1)2 > 25
42 + 22 > 25
16 + 4 > 25
20 > 25 which is not true
For B, put x = - 3 , y = 1
We get, (- 3 + 3)2 + (1 – 1)2 > 25
0 > 25 which is not true
For C , put x = 0 , y = 0
We get, (0 + 3)2 + (0 – 1)2 > 25
9 + 1 > 25
10 > 25 which is not true
For D, put x = 3 , y = 2
We get, (3 + 3)2 + (2 – 1)2 > 25
36 + 1 > 25
37 > 25 which is true
So, option D is true
Related Questions to study
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The world’s population has grown at an average rate of 1.9 percent per year since 1945. There were approximately 4 billion people in the world in 1975. Which of the following functions represents the world’s population P, in billions of people, t years since 1975 ? (1 billion = 1,000,000,000)
We know the world's population one year after 1975 can be written as food into 1.01, nine to twelve years after 1975 can be written as '4' into 1.0 192, and so on. Similarly, suppose we continue to calculate three years after 1975. In that case, the world population will be 4.1.0 1923, and finally, we can conclude that the world population two years after 1975, as determined by the function P of t, will be equal to 4 into 1.0 19 t, and we can see that option one is the correct answer.