This lesson plan is about teaching students about quadrilaterals. It involves several hands-on activities and discussions to help students understand the different types of quadrilaterals, including squares, rectangles, parallelograms, rhombi, trapezoids, and isosceles trapezoids. The students are divided into groups to describe shapes and identify properties. The teacher tells a story about "King Quadrilateral" and his family to reinforce the names and relationships between the different quadrilaterals. At the end, students review what they learned by identifying true or false statements about quadrilaterals.