We’re shaking up shapes for our #MondayMaths puzzle this week, by asking you to crack the mystery of an irregular polygon, H.
Its perimeter is almost completely constructed from the sides of several regular polygons. The task at hand: how do we work out the missing side of H?
This pretty puzzling problem fits well into the end of this term’s Year 7 mastery curriculum, where students will be looking at perimeter and word problems, having previously focussed on addition and subtraction of decimals.
Filling in the gaps
Too tricky for your year group?
This problem consolidates everything covered throughout Year 7 Autumn 1, but can be easily modified for other year groups.
Why not restructure the problem to give the shapes non-decimal side lengths?
This would make this problem accessible to Year 5 and Year 6 students as a multi-step perimeter problem and it builds on their knowledge of regular shapes.
Extending this task
Ask your students how they can use all of the shapes from A to E to create the smallest and largest perimeters.
The answer will be up on Twitter this Thursday. Get involved and share your feedback – did your class like this puzzle?Back to news list Next article