Reflect a triangle in an axis or the line y = x
Apply the reflection rule to the vertex you need.
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Triangle ABC has vertices A(−1, 2), B(2, −6) and C(1, −2). It is reflected: reflection in the line y = x. What are the coordinates of C'?
Answer: (-2, 1)
Triangle ABC has vertices A(4, 3), B(−2, −5) and C(−1, 2). It is reflected: reflection in the line y = x. What are the coordinates of A'?
Answer: (3, 4)
Triangle ABC has vertices A(4, 1), B(−3, −1) and C(2, 6). It is reflected: reflection in the y-axis. What are the coordinates of C'?
Answer: (-2, 6)
Tip: Apply the reflection rule to the vertex you need.
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