Question

in geometry, two figures are considered ____ if they have the same size and shape.
a ____ motion is a movement that does not alter the shape or size of a figure.
the type of rigid motion where a figure is slid in a straight line is called a ____.
when a figure is turned around a fixed point, this type of rigid motion is called a ____.
the rigid motion that creates a mirror image of a figure is called ____.
the line over which a figure is flipped during a reflection is known as the ____.
the point around which a figure rotates is known as the ____.
two figures that can be made to coincide by one or more instances of ____ are said to be congruent.
when proving congruence, if you need to turn a figure to make it fit over another, you are using a ____.
if two identical figures look like each other’s mirror images, you could use a ____ to prove their congruence.
when a shape is manipulated by sliding it either horizontally or vertically, this motion is known as a ____.

Explanation:

1. In geometry, congruent figures have same size/shape.
2. Rigid motion preserves shape/size.
3. Sliding a figure is translation.
4. Turning around a point is rotation.
5. Mirror - image creation is reflection.
6. Reflection uses a line of reflection.
7. Rotation has a center of rotation.
8. Rigid motions (translation, rotation, reflection) prove congruence.
9. Turning a figure uses rotation.
10. Mirror - image figures use reflection.
11. Sliding horizontally/vertically is translation.

Answer:

1. congruent
2. rigid
3. translation
4. rotation
5. reflection
6. line of reflection
7. center of rotation
8. rigid motion (or translation, rotation, reflection)
9. rotation
10. reflection
11. translation