Hardcore exam week coming soon for me. Cya guys for a while.

[Impossible]

heheheh then i may put some trigonometry and parabola questions xD

do it just now!

[Triad]

how to find |AC| ?
Anwser is D btw.

[Impossible]

first you can get cos(BD/ED) of BDE angle and count it, so you'll automatically get angle A, then find angle B by smaller triangle, after that you can find angle C, cuz C=180-A-B
you'll get all 3 angles of triangle and you have BA=4+2=6, so you can count all other sides cuz you have 1 side and 3 angles

[Statik]

lol Impo, go to school xD cosBDE = DB/ED only for http://en.wikipedia.org/wiki/Right_triangle

the solution is 2 lines:
1) Find out that small and big triangles are similar (2 equal angles): https://en.wikipedia.org/wiki/Similarity_(geometry)#Similar_triangles
2) Use proportion: 7/AC = 5/(4+2). AC = 42/5 = 8,4.

[Impossible]

yeah at first i thought the upper angle is 90 however after getting bad result i got im doing everything wrong but still decided to post this cuz thought people with IQ higher than 10 wont read this anyway. Thats 2nd time I catch myself being wrong today xD

[Triad]

thanks Statik +1 and lmao Impo, still +1 to that solution xDD