Step-by-step explanation:
Oops! I think you made a mistake-- you provided no image or anything else to explain!
No, two sides the same is not enough.
You need more proof.
Side, angle, side. (SAS).
AD = DC
Angle ADB = Angle CDB
BD = BD
By the SAS property, the two triangles are the same.
I think this is one way to prove it...
Or, similarly...use ASA, (Angle, side, angle).
1/2 IS the same as 0.5. Ratio is fairly easy. an example is 5/6. The ratio would be 5:6. Therefore 1/2 in ratio would be 1:2