chapter 7

Question 1

how to prove triangles are similar

Answer 1

aa, sss, sas

Question 2

scale model

Answer 2

smaller scale representation of larger object

Question 3

triangle proportionality thm

Answer 3

if a line parallel to a side of a triangle intersects the other two sides, then it divides those sides proportionally

Question 4

converse of the triangle proportionality thm

Answer 4

if a line divides two sides of a triangle proportionally, then its parallel to the third side

Question 5

two transversal proportionality corollary

Answer 5

if three or more parallel lines intersect two transversals, then they divide the transversals proportionally

Question 6

triangle angle bisector theorem

Answer 6

an angle bisector of a triangle divides the opposite sides into two segments that are proportional to the lengths of the other two sides

Question 7

proportional perimeter and areas theorem

Answer 7

if the similarity ratio of two similar figures is a/b that the ratio of their perimeters is a/b, and the ratio of their areas is a^2/b^2 or (a/b)^2

Question 8

if k is greater than 1

Answer 8

enlargement

Question 9

if 0

Answer 9

reduction

Question 10

indirect measurement

Answer 10

any method that uses proportions to measure

Question 11

to find if sides are proportional…

Answer 11

put equal sides into proportions and simplify the ratio

if the ratios are congruent, that is the similarity ratio and they are similar

Question 12

vector

Answer 12

starts at point, end with arrow, has direction and magnitude