Which of the following transformations to ∆ABC would NOT preserve size and shape

Transformation is the movement of a point from its initial location to a new location. Transforming an object involves transforming all its points. Types of transformation is reflection, rotation, translation and dilation.

Rigid transformations are transformations that preserves the size and shape of an object. There are three types of rigid transformation which are:

Rotation: This involves rotating a shape about a point.
Reflection: This is the flipping of a shape across a line
Translation: This is the sliding of an object up or down.

Dilation is the enlargement or reduction of shape of an object. Dilation is not a rigid transformation because it does not preserve the shape or size of the object.