Perimeter and area of plane figures
Exercises and articles on perimeter and area of squares, rectangles, triangles and composite plane figures.
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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.