Yes, The preimage and the image have the same shape and size.
The reflection of an object across an axis is creating an image that has the same shape and size.
A triangle ABC is reflected over the x-axis to form A'B'C'
When reflected over an axis, the coordinate of the other axis is changed to its additive inverse.
(x,y)-------> (x,-y)
Let the coordinate of the triangle is (1,1),(3,5),(3,1)
The image of the triangle when reflected over x-axis is
(1,1),(3,5),(3,1) -------------> (1,-1),(3,-5),(3,-1)
The shape of a right-angled triangle is the same in the image, the length of the side is same, it is just an image of the same shape and size.
The figure is attached with the answer.
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