Geometry Unit 4 Review Stella

Front

What is a translation in geometry?

Back

A translation is a geometric transformation that moves every point of a figure the same distance in a specified direction.

Front

How do you perform a reflection over the x-axis?

Back

To reflect a point (x, y) over the x-axis, the new coordinates become (x, -y).

Front

What is the scale factor in dilation?

Back

The scale factor is a number that scales, or multiplies, the dimensions of a figure. It is calculated by comparing the lengths of corresponding sides of the original and dilated figures.

Front

What is the algebraic rule for translating a point (x,y) to (x-4,y+5)?

Back

The algebraic rule indicates that to translate a point (x,y), you subtract 4 from the x-coordinate and add 5 to the y-coordinate.

Front

What does it mean to reflect a figure over the y-axis?

Back

Reflecting a figure over the y-axis means that for every point (x, y), the new point will be (-x, y).

Front

How do you rotate a figure 180° around the origin?

Back

To rotate a point (x, y) 180° around the origin, the new coordinates become (-x, -y).

Front

What are the coordinates of a point after a translation of (x,y)→(x+7,y-3)?

Back

The new coordinates will be (x+7, y-3).

Front

What is a rhombus in geometry?

Back

A rhombus is a type of polygon that is a quadrilateral with all four sides of equal length.

Front

How do you find the image of a point after dilation?

Back

To find the image of a point after dilation, multiply the coordinates of the original point by the scale factor.

Front

What is the result of reflecting a triangle over the y-axis and then rotating it 180°?

Back

The result is a triangle that is flipped horizontally and then inverted.