What is the full form of CRT​

Cathode-ray tube

Explanation:

Cathode Ray tube is the answer I think

1     sepan

2     encuentren

3     tenga

4     hable

5   parezca

6   llegue

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.