triangles
plane figures.
a cube!
Many figures. For example, an ellipse.
Rectangles and Rhombuses (have at least 2 lines of symmetry).
three triangles, and 1 square+2 triangles
Squares, Rectangles, Rhombuses, Trapezoids, Quadrilaterals, Pentagons, Hexagons, Octagons, and Decagons. 3D figures include cubes, pyramids, square pyramids, and rectangular prisms.
plane figures.
Pentagons
Planar figures ( Polygons) ; Circles, ellipses, triangles, squares, rectangles, parallelograms, trapeziums, Rhombus, Kite. Pentagons, hexagons, heptagons, Cuboid figures ; Spheres, Tetrahedrons, Pyramids, cubes, cuboid.
Pentagons are 5-sided figures.
It depends on the symmetry. Work out the area of half the shape by filling the shape with squares and triangles of known areas and times the answer by two.
trapezoids
2 trapezoids.
Trapezoids
trapezoids, parallelograms, and hexagons
Squares, Parallelograms, Trapezoids, Rectangles, and Rhombuses
Circles, rectangles, squares, pentagons, etc.