Download - Lesson 10-6 Pages 440-443
Lesson 10-6 Pages 440-443
Similar Figures
What you will learn!
How to determine whether figures are similar and find a missing length in a pair
of similar figures.
Similar figuresSimilar figures
Indirect measurementIndirect measurement
What you really need to know!
Two figures are similar if corresponding angles are congruent and corresponding sides are proportional. The symbol ~ means is similar to.
C
5 4
3A
B810
6 FD
E∆ABC ~ ∆DEF
C
5 4
3A
B8
10
6 FD
E
Corresponding angles
A D
B E
C F
Corresponding sides
6
3
8
4
10
5
Link to Pre-Made Lesson
Example 1:
If ∆ABC ~ ∆DEF, find the length of DF.
n
11
5.4
3 5.493 n
5.16n
Example 2:
A rectangular picture window 12-feet long and 6-feet wide needs to be shortened to 9-feet in length to fit a redesigned wall. If the architect wants the new window to be similar to the old window, how wide will the new window be?
n
6
9
12 5412 n
5.4nft5.4
Page 442
Guided Practice
#’s 3-5
Pages 440-441 with someone at home and study
examples!
Read:
Homework: Page 442-443
#’s 6-15 all
#’s 18-27 all
Lesson Check 10-6
Page
588
Lesson 10-6
Study Guide and Review
Pages
462-464
#’s 6-22(Odd answers in back of book)
Prepare for Test!
Pages
465
#’s 3-13, 16