Follow one fold at a time and pause whenever you want. Ask me about any step, any crease, or the symmetry and angles behind the dart.

Dart Paper Airplane

Fold a fast paper plane — and see the geometry hidden in its creases

Start with a rectangular sheet. Fold it in half lengthwise and unfold it: that first crease is a line of symmetry. Every later fold should meet the centre line in matching pairs, one on the left and one on the right.

Bring the two top corners to the centre crease. Each corner is 90°, and the fold cuts it into two 45° angles. The visible triangles on opposite sides are congruent mirror images. Repeat the same inward folds once more to sharpen the nose; the centre line is an angle bisector again.

Fold the plane in half along the centre crease, then bring each wing down. The wings are symmetric, and the angle you open between them is a dihedral angle. Change that angle and you change how air meets the wings — one reason a paper plane can climb, stall, or glide.

Pause the animation at any fold and ask the tutor why the corners line up, what angle a crease makes, or how symmetry helps the finished plane fly straight.

Related Topics

Paper Garrison CapPythagorean TheoremCongruence & Similarity
How do you make a dart paper airplane?
Use a rectangular sheet. Crease the long centre line, fold both top corners to it, fold the new angled edges to the centre again, fold the plane in half, and pull the wings down. Each left fold has a matching right fold.
What angles does a dart paper airplane use?
The first corner folds bisect each 90° corner and make 45° angles. Later folds follow the same centre line, so each pair of creases is a mirror image. The open wings also form a dihedral angle.
Why does a dart paper plane fly straight?
Its left and right halves are almost identical. Equal wings, matching folds, and a centred nose keep the lift and drag balanced. A twisted wing or an off-centre nose breaks that symmetry and makes the plane turn.
What paper is best for a dart paper airplane?
A standard sheet of A4 or letter paper is a good start. Very light paper folds easily but can flop; very heavy card is hard to crease and may be too heavy for the small wing area. Sharp, straight creases matter more than the exact brand.
Is a dart the same as a glider paper airplane?
No. A dart has a narrow, pointed nose and a long triangular profile, so it usually flies fast. A glider uses wider wings and a slower, floating design. Both still depend on symmetry and carefully matched folds.