Concept:A geoboard is a hands-on tool with nails arranged in a grid, used to explore plane geometry by stretching rubber bands to form shapes.
Explanation:Students can create polygons like triangles and rectangles directly on the geoboard.
They observe properties such as sides, angles, and diagonals of these shapes.
It helps in understanding area, perimeter, and symmetry through physical manipulation.
Thus, a geoboard is specifically effective for teaching geometrical shapes and their properties.
Answer:B. geometrical shapes and their properties