This area and perimeter riddle sheet is self checking. Students are asked to calculate the area of squares, rectangles, and triangles. They have to apply knowledge of squares to find measures of all sides when given the measure of one side. Students are asked to calculate the perimeter of squares, rectangles, triangles, pentagons, and heptagons. They have to apply knowledge of squares and rectangles to find measures of unknown sides when given measures of one or two sides.