Vela
Geometry Architects
Attributes, angles, symmetry, and moves on the grid. A shape keeps its name when you turn it.
Gates you can reach in any order: Quarry, Arches, Scaffolds, Gallery, Courts, Roofs, Windows, Spires.
1. Shape Quarry
QuarryThe quarry sorts stones by sides and corners. You choose an attribute, then whether turning a stone changes its name.
Grades K, 1, 2 · shape-attributes
2. Compose the Arch
ArchesAn arch is a plan of filled cells. You choose a silhouette, then whether to match the plan or only the number of blocks.
Grades 1, 2 · compose-shapes
3. Angle Scaffold
ScaffoldsA scaffold needs an exact angle. You choose the measure, then whether a square corner is 90 degrees.
Grades 4 · angles
4. Symmetry Gallery
GalleryA gallery asks which fold matches a figure onto itself. You choose a figure, then test the fold.
Grades 4 · symmetry
5. Quadrilateral Court
CourtsThe court sorts four-sided figures. You choose a rule, then whether a square counts as a rectangle.
Grades 4, 5 · classify-quads
6. Triangle Roofs
RoofsA roof is a triangle. You choose a gable, then whether to take half the surrounding rectangle.
Grades 6 · area-triangle
7. The Round Window
WindowsA round window needs circumference or area. You choose which measure, then whether to swap the formulas.
Grades 7 · circles
8. Slide, Turn, Flip
SpiresThe spire's plan is a point that must move. You choose a transformation, then check a right triangle with the Pythagorean theorem.
Grades 8 · transformations