Perimeter and area of plane figures
Exercises and articles on perimeter and area of squares, rectangles, triangles and composite plane figures.
Available exercises
Area by counting squares
Count unit squares to find the area of a rectangle.
Perimeter of a triangle
Add up the three side lengths to find the perimeter.
Area of squares and rectangles
Compute the area of a rectangle by counting unit squares or multiplying sides.
Perimeter of squares and rectangles
Compute the perimeter from given side lengths.