Class subject: Geometric figures.
The Basic Geometric figures included in the game are:
Equilateral triangle  All sides equal; Interior angles 60 degree.
Isosceles triangle  2 sides equal; 2 congruent angles.
Right triangle  1 Right angle.
Scalene triangle  No side or angle equal.
Acute triangle  All angles acute.
Obtuse triangle  1 obtuse angle.
Square  All sides equal; All angles right.
Rectangle  Opposite sides equal; All angles right.
Rhombus  All sides equal; Opposite angles equal; 2 pairs of parallel sides.
Parallelogram  Opposite sides equal; 2 pairs of parallel sides.
Trapezoid  1 pair of parallel sides.
Kite  Àdjacent sides equal; 2 congruent angles.
Triangle 
Rectangle 
Square 
Rhombus 
Kite 





References from
Math Salamanders. Geometric transparent pictures
here.