The area of triangle A'B'C' after reflection is: 6 square units.
What is the Area of a Triangle?
Area = ½(base)(height).
When triangle ABC is reflected across the line, the image created, triangle A'B'C' is a mirror image of triangle ABC.
They have the same height = 3 units; and the same base = 4 units.
Area of triangle A'B'C'= ½(4)(3)
Area of triangle A'B'C' = 6 square units.
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