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Unit 4
Stretching and Shrinking
17
Mathematics
7th Grade
12/12/2008
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Term
ray
 Definition
it's part of a line.
Term
line
 Definition
it extends without end in 2 directions.
Term
right angle
 Definition
it's 90 degrees.
Term
acute angle
 Definition
angle has a measure of less than 90 degrees.
Term
obtuse angle
 Definition
an obtuse angle has a measure of greater than 90 degrees and less than 180.
Term
straight angle
 Definition
angle has a measure of exactly 180.
Term
complimentary angles
 Definition
2 angles are if the sum of their measures is exactly 90 degrees.
Term
supplementary angles
 Definition
2 angles are if of their measure of 180.
Term
equilateral triangle
 Definition
it has three equal sides.
Term
isosceles triangle
 Definition
it has two equal sides.
Term
scalene triangle
 Definition
it has no equal sides.
Term
corresponding
 Definition
corresponding sides or angles have the same relative position in similar figures.
Term
equivalent ratios
 Definition
Ratios whose fraction representations are called equivalent ratios.
Term
midpoint
 Definition
A point that divides a line segment into two segments of equal lenght.
Term
ratio
 Definition
a ratio is a comparison of two quantities.
Term
scale factor
 Definition
the number used to multiply the lenghts of a figure to stretch or shrink it to a similar image.
Term
similiar
 Definition
in similiar figures the angles. are congrent/ identical/ same/ equal. to get a similiar figure all sides of the figure must enlarge of reduce by the same amount (proportional)
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