If a circle has a center at (2, -3) and passes through the point (5, -3), what i

Practice Questions

Q1
If a circle has a center at (2, -3) and passes through the point (5, -3), what is its radius?
  1. 3
  2. 5
  3. 4
  4. 2

Questions & Step-by-Step Solutions

If a circle has a center at (2, -3) and passes through the point (5, -3), what is its radius?
  • Step 1: Identify the center of the circle, which is given as (2, -3).
  • Step 2: Identify the point that the circle passes through, which is (5, -3).
  • Step 3: Use the distance formula to find the radius. The distance formula is: distance = √((x2 - x1)² + (y2 - y1)²).
  • Step 4: Assign (x1, y1) as the center (2, -3) and (x2, y2) as the point (5, -3).
  • Step 5: Substitute the values into the distance formula: distance = √((5 - 2)² + (-3 + 3)²).
  • Step 6: Calculate (5 - 2) which equals 3, and (-3 + 3) which equals 0.
  • Step 7: Substitute these values back into the formula: distance = √(3² + 0²).
  • Step 8: Calculate 3² which equals 9, and 0² which equals 0.
  • Step 9: Add these results: 9 + 0 = 9.
  • Step 10: Take the square root of 9, which is 3. This is the radius of the circle.
  • Distance Formula – The distance between two points in a Cartesian plane is calculated using the formula √((x2 - x1)² + (y2 - y1)²).
  • Circle Properties – A circle is defined by its center and radius, where the radius is the distance from the center to any point on the circle.
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