IM 8th Grade Unit 2 Review

Front

What is a scale factor?

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 two similar figures.

Front

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

Back

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

Front

What is the scale factor going from the larger triangle to the smaller triangle if the side lengths are 4 and 2?

Back

1/2

Front

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

Back

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

Front

What is the scale factor going from the smaller polygon to the larger polygon if the side lengths are 3 and 9?

Back

3

Front

What is the slope of a line?

Back

The slope of a line is a measure of its steepness, usually represented as 'm' in the equation of a line (y = mx + b). It is calculated as the rise over run.

Front

How do you calculate the slope of a line given two points (x1, y1) and (x2, y2)?

Back

The slope (m) is calculated using the formula m = (y2 - y1) / (x2 - x1).

Front

What is the slope of a line if it rises 3 units and runs 1 unit?

Back

3

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

If a triangle has two angles measuring 22 degrees and 58 degrees, how do you find the third angle?

Back

Subtract the sum of the two known angles from 180 degrees: 180 - (22 + 58) = 100 degrees.