Calculating the perimeter of unusual shapes can seem tricky, but there are simple ways to do it! Here are some easy strategies for Year 7 students:

1. Break the Shape Apart: Look at the irregular shape and divide it into smaller, regular shapes, like triangles, rectangles, or squares.

   Find the perimeter of each smaller shape using what you already know about their formulas.

   Then, just add all those perimeters together!

2. Use a Grid: If your shape is on a grid, you can count the edges along the grid lines.

   This makes it easy to find the perimeter without tricky math!

3. Measure with a Ruler: You can also physically measure the sides with a ruler.

   Just make sure to measure every side and use the same unit (like inches or centimeters) for all the measurements.

4. Remember the Formula: If you’re working with shapes that have straight sides, you can use a simple formula to find the perimeter.

   The formula is:

   $P = \text{Sum of all side lengths}$

   This means if you have sides $a, b, c,..., n$, you add them up like this:

   $P = a + b + c + ... + n$

By using these methods, Year 7 students can easily find the perimeter of irregular shapes. Plus, they will get better at understanding space and improve their math skills!