Im pretty sure that's a right triangle.
A shape with three and only three sides is a triangle, but it is not possible for a triangle to have three perpendicular sides.
A hexagon.
Hexagon.
triangle.
Not possible. The shape will either be incomplete or have intersecting lines.
How about a triangle which is a 2 dimensional shape with 3 sides
A shape that can have three pairs of perpendicular sides is a rectangular prism (or cuboid) when considering its three-dimensional form. Each pair of sides meets at right angles, creating a structure with three sets of perpendicular edges. In a two-dimensional context, no standard polygon can have three pairs of perpendicular sides, as it would require more than four sides, violating the definition of a polygon.
No but 2 of its 3 sides are equal in lengths.
No but it does have 3 sides 2 of which are of equal lengths.
square
2 equilateral triangles
An isosceles triangle