Question

I can half figure this one..

Look at the figure.
http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/pool_Geom_3641_1008_13/image0014e8cadde.jpg


Make a two-column proof showing statements and reasons to prove that triangle ABD is similar to triangle ABC.

Answer 1

I know that both triangles end up being 45-45-90.

Answer 2

if both end up to be 45-45-90 then doesnt that mean they're both isosceles?

Answer 3

Yes. But I have to prove its 45-45-90. :l I'm stuck.

Answer 4

using AAA test for similarity,u only need to show two pair angles equal...
first pair is the one with measure 45 degrees
second is angle A which is common to both triangles
3rd angle automatically equals because the sum of 3 angles is always 180
so both triangles are similar by AAA test

Answer 5

and u cannot prove it to be 45-45-90

Answer 6

I knew that... >.<

Answer 7

Thanks(:

Answer 8

welcome :)