Question

The figure shows a triangular park ABC. The area DEFC is cordoned off by putting barricades on the sides DE and EF.
What is the total length of the barricades DE and EF?



36 feet
90 feet
108 feet
120 feet

Answer 1

it is a ratio! 120/150

Answer 2

just use that ratio on 90 ft

Answer 3

so, you multiply (90) x (120/150)

Answer 4

and the result is 72

Answer 5

for EF

Answer 6

just use that ratio on DE

Answer 7

so the answer would be 90 ft?

Answer 8

no...

Answer 9

im confuse

Answer 10

EF = 72 ft

Answer 11

do you get how you get that number?

Answer 12

ok, let me start over

Answer 13

You need to find a ratio....

Answer 14

no how do you set up th 120/150 in a calcalator

Answer 15

just type (120)/(150)

Answer 16

you don't even need the parenthesis

Answer 17

anything else you need help on?

Answer 18

do u divied 120by 150

Answer 19

Okay, first of all, you have to see the two triangles in the question

Answer 20

okay! then

Answer 21

Find all the angles

Answer 22

how

Answer 23

In fact no, lemme draw a picture, hold on a second

Answer 24

Ohgod, too many tabs x.x
So, if you learned similar triangles, you know that the ratio of their sides are all the same, right?

Answer 25

okay

Answer 26

So AB/EB should be equal to AC/EF, do you see it?

Answer 27

see it where? on the picture i posted

Answer 28

Yes

Answer 29

ok yes i do

Answer 30

AB= 150 ft
EB = 120 ft

AC = 90ft
EF = ?ft

150ft / 120ft = 90ft/ EF

Now you have set up a proportion, solve it! :D

Answer 31

ok how i can i set up the proportion can you give me some steps or example on howe to do this type of problem

Answer 32

Alright, http://puu.sh/pZnD
In this picture, the red and the green triangle are overlapped

Answer 33

okay how is 150/120 equal to 90 did you divide or subtract

Answer 34

If you take them out, http://puu.sh/pZp0, do you see the ratio now?

Answer 35

http://puu.sh/pZpV
then
http://puu.sh/pZqu

Answer 36

You plugged this value back into the triangle, http://puu.sh/pZrZ

Answer 37

Now this is quite obvious.. :|
http://puu.sh/pZsW