How to prove similarity in junior high school mathematics and what conditions need to be met?

(1) Two angles are equal and two triangles are similar.

(2) The two sides are proportional and the included angle is equal, and the two triangles are similar.

(3) Three sides are proportional and two triangles are similar.

(4) If the hypotenuse and one right-angled side of one right-angled triangle are proportional to the hypotenuse and one right-angled side of another right-angled triangle,

Then these two right triangles are similar.

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