Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Grade 7 Chapter 5

Ratios, Proportions, and Similarity

center of dilation The point of intersection of lines through each pair of corresponding vertices in a dilation.
congruent angles Angles that have the same measure.
conversion factor A fraction whose numerator and denominator represent the same quantity but use different units.
cross products The product of numbers on the diagonal when comparing two ratios.
dilation A transformation that enlarges or reduces a figure.
enlargement An increase in size of all dimensions in the same proportions.
equivalent ratio Ratios that name the same comparison.
indirect measurement The technique of using similar figures and proportions to find a measure.
proportion An equation that states that two ratios are equivalent.
rate A ratio that compares two quantities measured in different units.
ratio A comparison of two quantities by division.
reduction A decrease in the size of all dimensions.
scale The ratio between two sets of measurements.
scale drawing A drawing that uses a scale to make an object smaller than or larger than the real object.
scale factor The ratio used to enlarge or reduce similar figures.
scale model A proportional model of a three-dimensional object.
similar Figures with the same shape but not necessarily the same size are similar.
unit price A unit rate used to compare prices.
unit rate A rate in which the second quantity in the comparison is one unit.
Created by: bookannelid