Flip flop
Geometry
Level
2
How many of the following 8 shapes must have (at least) one axis of symmetry:
\[\begin{array} { l l} \mbox{equilateral triangle, right triangle, square, cyclic quadrilateral,} \\ \mbox{parallelogram, rhombus, rectangle, regular pentagon? } \\ \end{array} \]
by
Arron Kau