- #1

thomas49th

- 655

- 0

I solved both questions, but how do I know that the triangle were similar, Im guessing it's somthing to do with the parallel lines...

ASA

SSS

SAS

RHS

^ I thought these were the ways to spot similar triangles...

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- Thread starter thomas49th
- Start date

- #1

thomas49th

- 655

- 0

I solved both questions, but how do I know that the triangle were similar, Im guessing it's somthing to do with the parallel lines...

ASA

SSS

SAS

RHS

^ I thought these were the ways to spot similar triangles...

- #2

neutrino

- 2,091

- 2

Edit: I now recollect... Angle-Side-Angle, Side-Side-Side... :)

- #3

thomas49th

- 655

- 0

and DAE = BAC and AEC = BAC

so is it AAA -- is there such a similar/congrucy thingy ma jig?

so is it AAA -- is there such a similar/congrucy thingy ma jig?

- #4

drpizza

- 286

- 0

To know the triangles are similar, you only need to know that two of the corresponding pairs of angles are congruent (because it follows that since the sum of the angles in a triangle is 180 degrees, the 3rd pair of corresponding angles would also have to be congruent.) Thus, AA is all that's needed for *similar* triangles.

Obviously, angle A is congruent to angle A (reflexive property)

You can do either or both of the other pair of corresponding angles just as you mentioned - it has to do with the parallel lines. "When a pair of parallel lines are cut by a transversal, the corresonding angles are congruent."

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