Perimeter and Area - Perimeter of Rectilinear Shapes - Presentation

In a comprehensive mathematics presentation, students are introduced to the concept of calculating the perimeter of rectilinear shapes. Rectilinear shapes are those with straight sides and right angles, such as rectangles and squares. The lesson begins with a discussion on what constitutes a rectilinear shape, followed by a series of activities where students are tasked with finding the perimeter of various rectilinear shapes. Some exercises provide the lengths of all sides, while others require students to determine the missing measurements to calculate the total perimeter. The activities range from simple shapes on a grid to more complex configurations made from identical rectangles.

The presentation further challenges students with reasoning tasks, where they must apply their understanding of perimeters to solve problems. One activity prompts them to explore the number of different shapes that can be created with a given perimeter. Another reasoning exercise involves identifying possible perimeters for a shape where all sides are equal and a whole number of centimetres. Students are encouraged to discuss their strategies and prove their reasoning, fostering a deeper comprehension of the relationship between side lengths and perimeters. Independent work tasks consolidate learning, as students work out missing sides and calculate perimeters, ensuring they can apply their knowledge in a variety of contexts.