Point B is the image of point A when point A is rotated about the origin. What is known about point A and B?

On a coordinate plane, point A is (negative 3, 4) and point B is (4, 3).
Point B is the result of a 180° rotation.
Point A and B have the same x-coordinate.
Point B is the result of a 90° counterclockwise rotation.
Point A and point B are the same distance from the origin.

1 answer

To evaluate the relationship between points A and B given that point A is (-3, 4) and point B is (4, 3), we can analyze each statement:

  1. Point B is the result of a 180° rotation.

    • A 180° rotation around the origin transforms (x, y) to (-x, -y). Rotating point A (-3, 4) by 180° gives (3, -4), which does not match point B (4, 3). Therefore, this statement is false.
  2. Point A and B have the same x-coordinate.

    • Point A has an x-coordinate of -3 and point B has an x-coordinate of 4. Since -3 ≠ 4, this statement is false.
  3. Point B is the result of a 90° counterclockwise rotation.

    • A 90° counterclockwise rotation transforms (x, y) to (-y, x). Applying this to point A (-3, 4) results in (-4, -3), which does not match point B (4, 3). Therefore, this statement is false.
  4. Point A and point B are the same distance from the origin.

    • The distance from the origin (0, 0) to a point (x, y) is calculated using the formula √(x² + y²).
    • For point A (-3, 4): Distance = √((-3)² + (4)²) = √(9 + 16) = √25 = 5.
    • For point B (4, 3): Distance = √((4)² + (3)²) = √(16 + 9) = √25 = 5.
    • Since both distances are equal (5 = 5), this statement is true.

In conclusion, out of the options provided, the only true statement is that point A and point B are the same distance from the origin.