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A triangle, ΔABD, is reflected across the y-axis to have the image ΔA'B'D' in the standard (x, y) coordinate plane: thus A reflects to A'. The coordinates of point A are (m, n). What are the coordinates of point A'?
  • a)
    (−m, n)
  • b)
    (m, −n)
  • c)
    (−m, -n)
  • d)
    (n, m)
  • e)
    Cannot be determined from the given information.
Correct answer is option 'A'. Can you explain this answer?
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A triangle, ΔABD, is reflected across the y-axis to have the ima...
A triangle is a polygon with three sides and three angles. It is a two-dimensional shape that is commonly studied in geometry. Triangles can be classified based on the lengths of their sides and the measures of their angles. Some common types of triangles include equilateral triangles, isosceles triangles, and scalene triangles. Triangles have many properties and formulas that can be used to find their area, perimeter, and other measurements. They are often used in various applications, such as in architecture, engineering, and art.
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A triangle, ΔABD, is reflected across the y-axis to have the ima...
The correct answer is a. To find the coordinates of vertex A after it is reflected across the y-axis, remember that a reflection across the y-axis does not change the sign of the y-coordinate but does change the sign of the x-coordinate. Therefore, you can eliminate answer choices b, c, and d. You might sketch a figure like the one below.

The reflection of A (m, n) across the x-axis is A( (−m, n). The most popular incorrect answer is J, which gives the reflection of A over the line y = x.
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A triangle, ΔABD, is reflected across the y-axis to have the image ΔABD in the standard (x, y) coordinate plane: thus A reflects to A. The coordinates of point A are (m, n). What are the coordinates of point A?a)(−m, n)b)(m, −n)c)(−m, -n)d)(n, m)e)Cannot be determined from the given information.Correct answer is option 'A'. Can you explain this answer?
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A triangle, ΔABD, is reflected across the y-axis to have the image ΔABD in the standard (x, y) coordinate plane: thus A reflects to A. The coordinates of point A are (m, n). What are the coordinates of point A?a)(−m, n)b)(m, −n)c)(−m, -n)d)(n, m)e)Cannot be determined from the given information.Correct answer is option 'A'. Can you explain this answer? for ACT 2025 is part of ACT preparation. The Question and answers have been prepared according to the ACT exam syllabus. Information about A triangle, ΔABD, is reflected across the y-axis to have the image ΔABD in the standard (x, y) coordinate plane: thus A reflects to A. The coordinates of point A are (m, n). What are the coordinates of point A?a)(−m, n)b)(m, −n)c)(−m, -n)d)(n, m)e)Cannot be determined from the given information.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for ACT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A triangle, ΔABD, is reflected across the y-axis to have the image ΔABD in the standard (x, y) coordinate plane: thus A reflects to A. The coordinates of point A are (m, n). What are the coordinates of point A?a)(−m, n)b)(m, −n)c)(−m, -n)d)(n, m)e)Cannot be determined from the given information.Correct answer is option 'A'. Can you explain this answer?.
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