This PDF contains 4 cards with shapes inscribed inside larger shapes. 1) rectangle inscribed inside of a rectangle 2) Circle inscribed inside a circle 3) square inscribed in a triangle, 4) three circles inscribed in a rectangle. There is also an answer sheet with each problem worked out step-by step.
I place students into 4 groups and have them rotate to different tables. At each of the 4 tables there is a different card where students need to find the area of the shaded region.