Quadrilaterals – identifying special shapes

MathematicsPlane GeometryAges 13–14

Drag the four vertices A, B, C, D on the grid; the simulation measures the sides, angles, and diagonals to identify a trapezoid, isosceles trapezoid, parallelogram, rectangle, rhombus, or square. A checklist of properties highlights which conditions currently hold, helping students see why the shape has that name.