Question

The coordinates of the centre of a circle are (4,2) and its radius is 5. Which among the foolowing is a point on the circle ?

• A. (7,2)
• B. (-7,-2)
• C. (7,-2)
• D. (-7,2)

Answer 1

Answer:

C. (7,-2)

$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

$=\sqrt{(7-4)^2+(-2-2)^2}$

$=\sqrt{9+16}=5$