How to calculate the perimeter of different shapes quiz for kids. Here children will learn how to calculate the perimeter of each shape shown in the case. The current quiz contains different combinations of squares and rectangles. Review basic geometry skills in this quiz particularly dealing with perimeters. The perimeter of a shape refers to the distance all around the shape. For example the distance around a square is two times the width plus two times the height. Other shapes with irregularities are calculated differently. This math practice is for kids in 2nd, 3rd, 4th , 5th grades.