7th Grade: Keep Forever
FOCUS
Use Ratio and Proportionality to Solve Problems
Solve Problems Involving Similar Triangles
VOCABULARY
Ratio
Equivalent ratios
Proportion
Rate
Unit rates
A comparison of two quantities
by division
Ratios that are equal
An equation that says two ratios
are equal
i.e. 2/3 = 4/6 or ¾ = 8/x
A comparison of two quantities
that have different units
i.e. 3 shirts for $25
Rates in which the second
quantity is 1 i.e. 25 miles for 1
gallon of gas
Unit price
Cross product
Similar figures
Corresponding sides
Corresponding angles
Dilation
Scale factor
Indirect measurement
Scale drawing
Scale
Reduction
Enlargement
Scale model
A unit rate used to compare price
per item i.e. $2.25 per jar
The product of numbers on the
diagonal when comparing two
ratios
Shapes that have the same shape
but not necessarily the same size
Matching sides of two or more
polygons
Angles in the same basic position
from one shape to another
A transformation that changes
the size but not the shape of a
figure
The ratio used to enlarge or
reduce a figure; the number the
sides are multiplied by
A way of using similar figures and
proportions to find a
measurement
A two dimensional drawing of an
object that is proportional to the
original object
The ratio of the dimensions in the
drawing to the dimensions of the
original object
A scale drawing or model that is
smaller than the original object
A scale drawing of model that is
larger than the original object
A 3D model that accurately
represents a solid object