- trapezium (trapezoid)
- isosceles trapezium
play 'guess my shape':
"I am thinking of one of these eight shapes
you can ask questions to find out which one it is but I can only answer yes or no to a question."
"What questions do you want to ask?"
"Now you have to try to find out my shape quickly - what questions do you want to ask?
"You can actually identify the shape in at most three questions.
What question do you ask first?"
one step difference:
can you put these into a line so that there is just one difference in shape properties between them?
e.g a rhombus or a rectangle could be placed next to a square