Sides (one at a time)
0
units
Perimeter (all the way round)
0
units
Perimeter = add up every side
🚶 Walk around the edge
↺ Reset shape
Drag the
brass dots
(the corners) to reshape the quadrilateral. Then hit
"walk around the edge"
— each side lights up and gets added on. The
perimeter is just every side added together
.