fabrc said:
Somebody can give me some tips? I'm really bad at this.
With Geometry, its great to do the basics with a real model, instead of just numbers.
Actually get some wood or cardboard and string, and measure out the angles, and observe the relationships etc. with a tape measure, protractor, compass and rule etc. get you dad to buy you a cheap laser measurer - none of this will be a waste of time, as the ability to measure will be a fantastic asset whether you become a Scientist, Surveyor or Sanitary Engineer.
Its such fun !
Get a sphere (beachball) and mark out the angles, hemispheres, Long and Lat.
Geometry is one of the few area that has a real physical presence, as well as a virtual concept.
Euclid (Father of Gemotry) did a lot of his work on a slate and sand, with a big Compass.
Here's a practical challenge that is huge fun.
Stand on one side of a river, street, canyon etc, and try to figure out how long a bit of string you would need to reach the other side without actually going there.
Hint - Tank Commanders use this principle to know how far away the enemy is.