Which pairs of polygons are similar?
select each correct answer.

Similar polygons are polygons with the same shape, but different size:

We can discard the first pair because both triangles are from different types.

The second pair (the rectangles, top right) if they are similar, then the quotient between the lengths of the sides must be the same: 16/10 = 1.6 = 22/13.75

The triangle rectangles also are not similars, you can see that the quotient between the cathetus is different.

For the trapezoids you may see the quotients betwen base and top and the quotients between base and height.

8/5 = 1.6 = 20/12.5

8/3 = 2.66 = 20/7.5

With this information we can see that this pair may also be similar, buth the trapezoids are mirrored and not rotated (so in one the left side is angled, and in the other the right side is angled) so we can conclude that this pair is not similar.

The only right answer is the pair of rectangles.

the string with the finger instead of using the bow

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !