Math STAAR Review Transformations

Which rule represents a dilation of a figure by a scale factor of 5 that is centered at the origin?

• (x,y) -> (1/5x, 1/5y)

• (x,y) -> (5x, 5y)

• (x,y) -> (x + 5, y + 5)

• (x,y) -> (x - 5, y - 5)

Rectangles ABCD and A´B´C´D´ are shown on the coordinate plane. Which algebraic representation shows how the coordinates of rectangle A´B´C´D´ were found?

• (1/2x, 1/2y) -> (x,y)

• (x,y) -> (1/2x, 1/2y)

• (2x, 2y) -> (x,y)

• (x,y) -> (2x, 2y)

Triangles KLM and K´L´M´ are shown on the coordinate plane. Which algebraic representation shows how to find the coordinates K´L´M´ ?

• (3/2x, 3/2y) -> (x,y)

• (2/3x, 2/3y) -> (x,y)

• (x,y) -> (3/2x, 3/2y)

• (x,y) -> (2/3x, 2/3y)

Which proportion must be true if the trapezoids in the figure are similar?

• 12/y = 5/10

• y/12 = x/8

• 8/x = y/12

• x/8 = 2/4

Q10

• F

• G

• H

• J

Q21

• A

• B

• C

• D

Pentagon WXYZ is shown on the coordinate grid. A student reflected pentagon WXYZ across the x-axis to create pentagon W'X'Y'Z'. Which rule describes this transformation?

• (x, y) → (x, -y)

• (x, y) → (x, y + 8)

• (x, y) → (-y, x)

• (x, y) → (-x, y)

Identify the transformation from ABC to A'B'C'.

• (x+8, y+4)

• (x-8, y-4)

• (x+4, y+8)

• (x-4, y-8)

What type of transformation is this?

• rotation

• translation

• reflection

• dilation

• A

• B

• C

• D