triangles
plane figures.
a cube!
Rectangles and Rhombuses (have at least 2 lines of symmetry).
Many figures. For example, an ellipse.
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, parallelograms, and hexagons
trapezoids
2 trapezoids.
Trapezoids
Squares, Parallelograms, Trapezoids, Rectangles, and Rhombuses
Circles, rectangles, squares, pentagons, etc.