If you are talking about the 4 on top of the other 4 it means that there are 4 beats in a measure. if you are talking about the f at the bottom that means forte, or loud (play loud)
Curvilinear- adjective
definition: contained by or consisting of a curved line(s).sentence: Some roof companies will recommend curvilinear roofs instead of straight line roofs.
Form- noun
definition: the visible shape or configuration of an object or thing
sentence: The form of the ball if round and circular, while the form of the block is square and rectangular.
<span>Sergio Leone directed the 1966 "Spaghetti Western" film The Good, The Bad, and The Ugly. Leone's groundbreaking new way of shooting his films led the way for future film-makers and inspired a whole generation of media-makers to step out of the box and make art rather than conventional entertainment.
Hope I could help!</span>
For perimeter you just add up the sides. 8+9+11=28 so the perimeter would be 28 in. Never forget the unit!!