1. ## Heeelllllppppp Mmmeeee!!!! :)

Given: Line AB is parallel to Line DC.
What postulate or theorum justifies the statement..Triangle ABE is similar to Triangle CDE.

Find the values of x and y. Please explain how to find x and y!!! Soo confused. Need help! Thanks!

2. Originally Posted by whytechocolate01
Given: Line AB is parallel to Line DC.
What postulate or theorum justifies the statement..Triangle ABE is similar to Triangle CDE.

Find the values of x and y. Please explain how to find x and y!!! Soo confused. Need help! Thanks!
was there a diagram that came with this question?

3. ## Diagram

Soo sorry....Must have not gone thru...Here it is.

4. Using the alternate interior and the vertical angle theorems, you can get three pairs of congruent angles. Thus by AAA you have two similar triangles.

5. Plato, could you please explain in detail?

6. Originally Posted by janvdl
Plato, could you please explain in detail?
No, I will not do that. I do not believe in supplying fully worked out solutions. I think that we should help others learn mathematics and simply giving out a complete solution does not accomplish that objective. As you know there are others here will do that. So just wait they will come along and work it out.

7. Originally Posted by whytechocolate01
Given: Line AB is parallel to Line DC.
What postulate or theorum justifies the statement..Triangle ABE is similar to Triangle CDE.

Find the values of x and y. Please explain how to find x and y!!! Soo confused. Need help! Thanks!

Ah wait i got it.

A = C
B = D
E = E

ABE ||| CDE

Thus:
6/14 = 7/y
6y = 98
y = 16,33

And:
6/14 = 9/x
x = 21

8. i like the idea of interior angles and verticle angles

interior angles - and two parralel lines, their opposite, interior angles, along a transversal of the two parrel lines are equal

verticle angles - whenever theres an X the two opposite angles are equal

so AAA makes them similar

9. Originally Posted by janvdl
Ah wait i got it.

A = C
B = D
E = E

ABE ||| CDE

Thus:
6/14 = 7/y
6y = 98
y = 16,33

And:
6/14 = 9/x
x = 21
why do you use commas for decimals?

10. I think the Americans use dots and im not sure about the Brits and other Europeans, but South Africans use the comma to indicate a decimal.

In SA a dot means multiply (2.3 = 6)

11. Originally Posted by janvdl
I think the Americans use dots and im not sure about the Brits and other Europeans, but South Africans use the comma to indicate a decimal.

In SA a dot means multiply (2.3 = 6)
ok, just wanted to know. because i have a TA that uses commas for decimals as well, so i was wondering if it's a regional thing. but i guess it avoids confusion, since dots and decimals get confused sometimes.

why don't people use the x anymore to represent multiply when they get to higher mathematics? is there a problem with x?

12. No we still use "x" too. But sometimes lots of x's can make a problem look very clumsy.