In this lecture for Classes 3–5, students explore three important quadrilaterals the square, kite, and trapezium. The lesson covers each shape’s key properties such as side lengths, angle measures, parallel sides, and diagonal relationships. Students learn important formulas for perimeter and area, as well as unique features like symmetry in kites and the mid-segment in trapeziums. The lecture also includes interactive worksheets (fill-in-the-blanks, matching, true/false) and a multiple-choice quiz to strengthen understanding and recall of concepts related to quadrilaterals.