Question

In the two similar trapezoids below, HE = 20, what is DA?

Answer 1

I believe its ten!

Answer 2

find the scale factor first

Answer 3

How do you do that?

Answer 4

@bibby?

Answer 5

in similar polygons, corresponding sides are in the same proportion. set up a ratio

I used this http://www.wolframalpha.com/input/?i=%2810x%29%2F30%3D56%2F%2842x%29

found x =2

plug that back in and you see that GF is 20 and CB is 30
20y=30 solve for y and find our scale factor

Answer 6

Did it! I believe the answer is 40? If I did it corrrectly

Answer 7

uhhh let's see, the scale factor is 30/20 which is 3/2 which is 1.5

Answer 8

if HE is 20 then DA is 20*1.5

Answer 9

30?

Answer 10

yeah

Answer 11

Ok, thank you!:)

Answer 12

disclaimer, im drunk and tired so work it out for yourself to make sure that's right

Answer 13

Drunk?????? oh god.. lol

Answer 14

heck yeah
adult lyfe maaaaaaaaaaaaaaaaaan

Answer 15

How old are you?

Answer 16

#irresponsibleadultlife;)

Answer 17

22
anyhow you can kinda check it because we found that GF was 20, right?

the corresponding length on the 2nd polygon is 30

Answer 18

Is that you in your profile picture?

Answer 19

I did! The correct answer is 30!

Answer 20

nope, I found him here

sweeeet

Answer 21

PM me!