Does anyone know this?

(puu.sh)

1 Answer
Feb 16, 2018

I suppose option A (triangleADE ~triangleABC)(ADE~ABC) is correct.

this is because, it is already given that, color(magenta)(angleD = angleBD=B
color(magenta)(angle AA is shared by both the triangles,

now,
angle E = 180^@ - angleA - angle DE=180AD
angle C = 180^@ - angleA - angle BC=180AB
=>color(magenta)(angle E =angle CE=C

Hence, since the corresponding angles are equal, the triangles are similar by, AAA rule