AMO Grade 4 · 9. Perimeter and area
Perimeter and area of rectangles, squares, staircase and overlapping shapes, L-shapes and triangles, with pictures to scale and five official AMO examples.
Tell perimeter from area and use the right formula and unit.
Find perimeters of staircase, notched and overlapping shapes quickly.
Find areas by cutting into rectangles or by filling up and subtracting.
Find areas of triangles on grids and of shapes made of equal pieces.