Geometry Pictionary
Teachers and/or students could create a math pictionary by taking pictures to represent vocabulary or concepts in math. Here is an example of a geometry pictionary:
Acute angles 
Can you find the acute angles in this picture? Click on the picture to see the answer. 
Can you find the obtuse angle on the arm of the basketball player? Click on the picture to see the answer. 

Parallel lines 
Can you find the parallel lines in this picture? Click on the picture to see the answer. 
Right Angles 
Can you find the right angles in this floor plan? Click on the picture to see the answer. 
Does this fountain have rotational symmetry? Why or why not? Click on the picture to find out the answer. 

Can you find the trapezoids in this picture? Click on the picture to see the answer. 

Can you find the triangle in this picture? Click on the picture to see the answer. 