8th Grade Semester 1 Review

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet. They are always the same distance apart and have the same slope.

Front

What is the sum of the measures of supplementary angles?

Back

The sum of the measures of supplementary angles is 180 degrees.

Front

What is the sum of the measures of complementary angles?

Back

The sum of the measures of complementary angles is 90 degrees.

Front

What is a dilation in geometry?

Back

A dilation is a transformation that alters the size of a figure but not its shape, using a scale factor.

Front

What is the scale factor in a dilation?

Back

The scale factor is the ratio of the length of a side of the image to the length of the corresponding side of the original figure.

Front

What does the transformation (x, y) → (−x, −y) represent?

Back

This transformation represents a 180° rotation about the origin.

Front

What is direct variation?

Back

Front

How do you find the constant of variation in direct variation?

Back

To find the constant of variation (k), divide y by x when given a pair of values.

Front

What is a transformation in geometry?

Back

A transformation is an operation that moves or changes a shape in some way, such as translation, rotation, reflection, or dilation.

Front

What is the difference between congruent and similar figures?

Back

Congruent figures have the same shape and size, while similar figures have the same shape but may differ in size.