Look at the attachment.

A.  d² =  132² + 86²

Step-by-step explanation:

if he wants to leave 2 cm on both sides, left = 136 - 2 - 2 = 132

then length = 132 cm

then width = 86 cm

using formula :

length² + width² = diagonal²

diagonal² = 132² + 86²

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.

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base