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Triangle Similarity 7-1:7-4
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Key vocab from 7-1 to 7-4
Terms in this set (13)
Proportion
a relationship between two ratios where those ratios are equal
Ratio
a relationship between two numbers or items
Three Ways To Write a Ratio
3:1, 3 to 1, or 3/1
Cross Product
the result of multiplying across the diagonals in a proportion
Checks for proportionality
it must have an = sign, and the cross product must work
Similar polygons
two polygons where corresponding angles are congruent and the sides are proportional
SSS Similarity
The measures of the corresponding sides of two triangles are proportional, then the triangles are similar
AA Similarity
if two angles of one triangle are congruent to two angles of another triangle, then the two triangles are similar
SAS Similarity
If the measure of two sides of a triangle are proportional to the measures of two corresponding sides of another triangle and the included angle is congruent then the triangles are similar.
16:9
A common widescreen TV aspect ratio
4:3
A common laptop screen aspect ratio
The Difference Between Similarity and Congruence
In congruence - all side and angles are the same -- similarity angles are the same, side are proportional
Hypsometer -
a device using similar triangles used to find distance.
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