Geo Midterm Unit 4 Review

Front

What is point symmetry?

Back

Point symmetry occurs when every part of a shape has a matching part at an equal distance from a central point, such that the shape can be rotated 180 degrees and still look the same.

Front

What is line symmetry?

Back

Line symmetry (or reflection symmetry) occurs when a shape can be divided into two identical halves that are mirror images of each other along a line.

Front

Which letters have line symmetry?

Back

Letters with line symmetry include A, H, I, M, O, T, U, V, W, X, and Y.

Front

Which letters have point symmetry?

Back

Letters with point symmetry include B, C, D, H, I, O, X.

Front

What is a dilation in geometry?

Back

A dilation is a transformation that alters the size of a shape but keeps its proportions the same, defined by a scale factor (k).

Front

How do you perform a dilation with a scale factor of k = 2 on point A(-2, 2)?

Back

To dilate point A(-2, 2) by a scale factor of 2, multiply both coordinates by 2: A' = (-2*2, 2*2) = (-4, 4).

Front

What is a reflection in geometry?

Back

A reflection is a transformation that flips a shape over a line, creating a mirror image.

Front

What is the result of reflecting the point (x, y) over the x-axis?

Back

The result of reflecting the point (x, y) over the x-axis is (x, -y).

Front

What is the result of reflecting the point C(-6, 2) over the line y = x?

Back

The result of reflecting the point C(-6, 2) over the line y = x is C' (2, -6).

Front

What is the result of reflecting the point B(-1, -1) over the line y = x?

Back

The result of reflecting the point B(-1, -1) over the line y = x is B' (-1, -1) (it remains unchanged).