Lisandro is using this diagram to find the equation of a circle. He notices that the radius, the blue line, and the red line form a right triangle. Which shows his correct reasoning and equation
a) The length of the red line is |x + h|.
The length of the blue line is |y + k|.
The equation of a circle is (x + h) 2 + (y + k) 2 = r2.
b) The length of the radius is r.
The area of a circle is πr2.
The equation of the circle is y = πr2x.
c) The length of the red line is |x - h|.
The length of the blue line is |y - k|.
The equation of a circle is (x - h) 2 + (y - k) 2 = r2.
d) The length of the red line is |x - h|.
The length of the blue line is |y - k|.
The equation of a circle is (x - h) 2 + (y - k) 2 = r.
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