Quadrilaterals: Frame & Crease Lab
Construct rectangles, rhombuses, and kites with diagonals, solve carpenter angle problems, and master origami crease shapes!
Diagonals tell the whole story! When equal diagonals bisect each other, you always get a rectangle. If they also cross at 90°, it becomes a square!
Warmup: Which Quad? Origami Crease
Fold a paper into quarters and make a single triangular crease cut at the central folded corner. What shape is revealed when completely unfolded?
A carpenter joins two thin wooden strips at their midpoints. Strip 1 has length 8 cm. For the frame perimeter to form a Rectangle, what must be the length of Strip 2?
In rectangle ABCD, the angle between the diagonal and base side is given below. Find the missing interior diagonal angle!
In the quadrilateral below, use the parallel transversal properties (adjacent interior angles sum to 180°) to deduce the missing angle.
Adjust diagonal lengths and the intersection angle to inspect what quadrilateral forms in real-time!