8-1.3 Similar Polygons

# 8-1.3 Similar Polygons - 12in 36in 126in 42in The 2 pics...

This preview shows pages 1–10. Sign up to view the full content.

8.3 Similar Polygons Pg 473

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Similar polygons Similar polygons- 2 polygons that have 2245 corresponding s and proportional corresponding side lengths. A B C D W X Y Z ZW DA YZ CD XY BC WX AB = = = ABCD~WXYZ
Trapezoid ABCD~ Trapezoid WXYZ. List all the pairs of 2245 s and a statement of proportionality of the ratios of the corresponding sides A 2245 ∠ W B 2245 ∠ X C 2245 ∠ Y D 2245 ∠ Z A B C D W X ZW DA YZ CD XY BC WX AB = = =

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Example decide whether the Δs are ~. A B C X Z Y _ 4 7 12 12 21 36 ) )) Yes, because all corresponding s are 2245 and there is a ratio of 1:3 between all pairs of corresponding sides.
Example cont. L M P Q R 10.5 18 12 12 4 9 Not ~ because not all the corresponding s are 2245 ( )

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Scale Factor Scale factor- the ratio of the lengths of 2 corresponding sides of ~ polygons.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: __ __ __ 12in 36in 126in 42in The 2 pics are ~, what is the scale factor b/t the 2? 7 2 enlargement painting Example cont. What would the ratios of the perimeters be? • 2(12)+2(36)=96 • 2(42)+2(126)=336 • 7 2 336 96 = in in Thm 8.1 • If 2 polygons are ~ then the ratio of their perimeters is = to the ratio of their corresponding lengths Ratio of perimeters = scale factor Example: parallelogram ABCD ~ parallelogram GBEF. Find the value of y and the ratio of the perimeters. B G E F C Y 12 15 y 12 24 15 = 15y=288 y=19.2 Ratio of Perimeters = 5/8 Assignment Assignment...
View Full Document

{[ snackBarMessage ]}

### Page1 / 10

8-1.3 Similar Polygons - 12in 36in 126in 42in The 2 pics...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online