The perimeter of 2D Shapes. Sample questions for a better understanding of the concepts along with the solution for self-analysis.
1. Perimeter of 2D
2. Starter: It’s a Match Task: Match up the name to its shape. There may be more than one answer as well as some red herrings! Rectang Parallelogra Trapeziu Triangle Square le m m Extension: Choose a shape and describe its properties using the keywords vertices, faces and edges, lines of symmetry, parallel, angles.
3. Starter: It’s a Match - Answers Triangle Trapezium Square Parallelogram
4. What Is Perimeter? Pause for Thought The perimeter of a shape is the total What is ‘perimeter’? distance around its edge. Can you think of a definition? To calculate the perimeter, we add Pause for Thought up the lengths of all of its sides. How do we calculate perimeter?
5. When Will I Need Perimeter? Pause for Thought Can you think of any real-life Decorating examples of when you might houses need to calculate a perimeter? Building projects Farmin g Wrapping presents Fencing off an area
6. Calculating Perimeter Calculate the perimeter of this square. 5cm 5+5+5+5= 20cm or 5 × 4 = 20cm Too easy? Try this! Calculate the perimeter of a square where one side is equal to 4 + 2 × 2cm. 8 × 4 = 32cm
7. Calculating Perimeter Calculate the perimeter of this rectangle. 10cm 10 + 4 + 10 + 4 = 28cm or (10 + 4) × 2 = 28cm Too easy? Try this! Calculate the perimeter of a rectangle where the width is 5cm and the length is 0.2m. Give your answer in centimetres. 0.2m = 20cm (20 + 5) × 2 = 50cm
8. Calculating Perimeter Calculate the perimeter of this triangle. 8cm 4cm 10 + 8 + 4 = 22cm 10cm Too easy? Try this! Calculate the perimeter of an equilateral triangle, which has a side length of 6 × 3 = 18cm
9. Calculating Perimeter Calculate the perimeter of this parallelogram. 11cm 11 + 7 + 11 + 7 = 7cm 36cm or (11 + 7) × 2 = 36cm Too easy? Try this! Calculate the perimeter of a parallelogram where the width is 0.15m and the length is 20cm. Give your answer in centimetres. 0.15m = 15cm (20 +15) × 2 = 70cm
10. Calculating Perimeter Calculate the perimeter of this trapezium. 6cm 12 + 7 + 6 + 7 = 7cm 7cm 32cm 12cm Too easy? Try this! Calculate the perimeter of a trapezium which has the measurements of 10cm, 8cm, 0.12m and 70mm. Give your answer in centimetres. 0.12m = 12cm 70mm = 7cm 10 + 8 + 12 + 7 = 37cm
11. Calculating Perimeter What is the total perimeter for the following shape? 3c m 4c m 9cm Pause for Thought 10c What information is missing? m 6cm 12c m 12 + 10 + 3 + 4 + 9 + 6 = 44cm
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