Illustrative Grade 8 Unit 2

Front

What is dilation in geometry?

Back

Dilation is a transformation that alters the size of a figure but keeps its shape the same, using a scale factor.

Front

What does a scale factor of 2 mean in dilation?

Back

A scale factor of 2 means that the new figure is twice the size of the original figure.

Front

If point B is dilated with a scale factor of 2, how do you find the coordinates of B prime?

Back

Multiply the coordinates of point B by the scale factor. For example, if B is at (x, y), then B' will be at (2x, 2y).

Front

What does it mean for two shapes to be similar?

Back

Two shapes are similar if they have the same shape but not necessarily the same size, and their corresponding angles are equal.

Front

What is the difference between congruent and similar shapes?

Back

Congruent shapes are identical in size and shape, while similar shapes have the same shape but may differ in size.

Front

How do you determine if a rectangle is a scaled copy of another rectangle?

Back

A rectangle is a scaled copy if the ratio of the lengths of corresponding sides is the same.

Front

What are the dimensions of a rectangle that is a scaled copy of a rectangle measuring 6 cm by 4 cm with a scale factor of 3?

Back

The dimensions would be 18 cm by 12 cm.

Front

If Rectangle A measures 6 cm by 4 cm, which of the following could NOT be the dimensions of a scaled copy? 12 cm by 10 cm, 12 cm by 8 cm, 18 cm by 12 cm, 24 cm by 16 cm?

Back

12 cm by 10 cm could NOT be the dimensions of a scaled copy.

Front

What is the formula to find the new coordinates of a point after dilation?

Back

New coordinates = (scale factor * original x-coordinate, scale factor * original y-coordinate).

Front

What is the angle sum property of triangles?

Back

The angle sum property states that the sum of the interior angles of a triangle is always 180 degrees.