https://www.ebay.co.uk/itm/GT-tandem-cycle/272692313074
GT Triple Triangle Tandem.
Affordable and with a best offer button!
I counted at least 7 triangles
You missed 2 Trapidoids, a Pentagon, and 5 Circles. Can only give you a B- for that homework ;-)
But I agree with you, it's shouldn't be too flexible !
@Bobbygp started
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https://www.ebay.co.uk/itm/GT-tandem-cycle/272692313074
GT Triple Triangle Tandem.
Affordable and with a best offer button!