IM 8th Grade Unit 2 Review

Front

What is a scale factor in geometry?

Back

A scale factor is a number that scales, or multiplies, some quantity. In geometry, it is the ratio of the lengths of two corresponding sides of similar figures.

Front

How do you find the scale factor from a larger triangle to a smaller triangle?

Back

To find the scale factor, divide the length of a side of the smaller triangle by the length of the corresponding side of the larger triangle.

Front

If the scale factor is 1/2, what does that mean for the size of the figure?

Back

It means the figure is reduced to half its original size.

Front

What is the scale factor from a small trapezoid to a big trapezoid if the scale factor is 2?

Back

The big trapezoid is twice the size of the small trapezoid.

Front

What does it mean for two figures to be similar?

Back

Two figures are similar if they have the same shape but not necessarily the same size, and their corresponding angles are equal while their corresponding sides are in proportion.

Front

How do you find a missing side in similar figures?

Back

Set up a proportion using the lengths of the corresponding sides of the similar figures and solve for the missing side.

Front

What is the formula for finding the slope of a line?

Back

The slope (m) is calculated using the formula m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are two points on the line.

Front

What does a slope of 2 indicate about a line?

Back

A slope of 2 indicates that for every 1 unit increase in x, the value of y increases by 2 units.

Front

What are corresponding parts in similar figures?

Back

Corresponding parts are the sides and angles of similar figures that are in the same relative position.

Front

If Side JL corresponds to Side ST, what can we say about their lengths?

Back

The lengths of Side JL and Side ST are proportional based on the scale factor of the similar figures.