A hexagon.
no, it has 3 sides, and none are parallel.
No but it does have 3 sides 2 of which are of equal lengths.
No. For example, the two perpendicular sides can be adjacent; in this case, the two sides can be of different length; the lengths of the other two sides aren't unique either.The two perpendicular sides can also be the two opposite sides (i.e., side #1 and side #3, if you count consecutive sides); here, too, there are multiple possible solutions. Just try it out!
An equilateral triangle has 3 equal sides and with 3 lines of symmetry because each of its vertices is centrally perpendicular to its opposite sides
A hexagon.
My Guess is a hexagon
No, it does have 3 sets of parallel sides though.
17-12____5
A shape with three and only three sides is a triangle, but it is not possible for a triangle to have three perpendicular sides.
square
The perpendicular adjacent sides in the triangle would be 3 sides. It is the basically horizonstal line next to a vertical line(perpendicular) if it was parallel adjacent then only two side of triangle /\ <-- parallel
no, it has 3 sides, and none are parallel.
No but its 3 sides are equal in lengths.
Hexagon.
No but 2 of its 3 sides are equal in lengths.
Im pretty sure that's a right triangle.