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# Area of rectangles and triangles

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• Give each student a rectangle with measurements on the side. Get them to fold along the diagonal and discuss how we made a rectangle into a triangle. Discuss how this works and see if we can come up with a rule. Write it on the white boards. Then see if we can write it as a algebraic formula.
• ### Area of rectangles and triangles

1. 1. Entry Activity Look at the cards on your desk. In pairs discuss match thekey words to the definitions.
2. 2. The space inside the shapeArea Remember: The grass inside a field The length around the outside of a shapePerimeter Remember: The fence around the field A four sided shape, two sets of parallel sides, two pairs ofRectangle sides that are the same length, all angles are 90˚ A four sided shape, all sides are the same length,Square all angles are 90˚, two pairs of parallel sides A shape with three sides, all the sides are straightTriangle This shows a measurement of areacm² A shape with only straight sidesPolygon Side by side and having the same distanceParallel continuously between them
3. 3. • I will learn to calculate the area of squares and rectangles by counting squares Level 3• I will learn to calculate the area of squares and rectangles using lengths Level 4• I will learn to calculate the area of a triangle Level 5• Challenge Objective: I will learn to calculate the area of compound shapes Level 5+
4. 4. I will learn to calculate the area of squaresand rectangles by counting squares Level 3
5. 5. I will learn to calculate the area of squaresand rectangles by counting squares Level 3
6. 6. • I will learn to calculate the area of squares and rectangles by counting squares Level 3• I will learn to calculate the area of squares and rectangles using lengths Level 4• I will learn to calculate the area of a triangle Level 5• Challenge Objective: I will learn to calculate the area of compound shapes Level 5+
7. 7. I will learn to calculate the area of squares and rectangles using lengths Level 4 9 cm
8. 8. I will learn to calculate the area of squares and rectangles using lengths Level 4 108cm² 9cm² 25cm² 24cm² 35cm² 9 cm 84cm² 49cm² 54cm² 81cm² 121cm² 147cm² 20cm² 22.75cm² 45cm² 0.25cm²
9. 9. • I will learn to calculate the area of squares and rectangles by counting squares Level 3• I will learn to calculate the area of squares and rectangles using lengths Level 4• I will learn to calculate the area of a triangle Level 5• Challenge Objective: I will learn to calculate the area of compound shapes Level 5+
10. 10. I will learn to calculate the area of a triangle Level 5
11. 11. I will learn to calculate the area of a triangle Level 5
12. 12. I will learn to calculate the area of a triangle Level 5
13. 13. • I will learn to calculate the area of squares and rectangles by counting squares Level 3• I will learn to calculate the area of squares and rectangles using lengths Level 4• I will learn to calculate the area of a triangle Level 5• Challenge Objective: I will learn to calculate the area of compound shapes Level 5+
14. 14. Challenge Objective: I will learn to calculate the area of compound shapes Level 5+ 10cm 2cm Rectangle A 4cm Rectangle B 3cm
15. 15. Challenge Objective: I will learn to calculate the area of compound shapes Level 5+
16. 16. Challenge Objective: I will learn to calculate the area of compound shapes Level 5+ 76cm² 19cm² 16cm² 36cm² 88cm² 48cm²
17. 17. Challenge Objective: I will learn to calculate the area of compound shapes Level 5+
18. 18. Challenge Objective: I will learn to calculate the area of compound shapes Level 5+ 64cm² 64cm² 35cm² 136cm²
19. 19. Progress SheetI can calculate the area of squares and rectangles by counting squares Level 3I can calculate the area of squares and rectangles using lengths Level 4I can calculate the area of a triangle Level 5I can calculate the area of compound shapes Level 5+
20. 20. Red QuestionCalculate the area of the shape below
21. 21. Pink QuestionCalculate the area of the shape below
22. 22. Salmon QuestionCalculate the area of the shape below
23. 23. Purple QuestionCalculate the area of the shape below
24. 24. Yellow QuestionCalculate the area of the shape below
25. 25. Gold QuestionCalculate the area of the shape below
26. 26. Mint QuestionCalculate the area of the shape below
27. 27. Blue QuestionCalculate the area of the shape below
28. 28. Green QuestionCalculate the area of the shape below
29. 29. Answer of 16cm²Area of compound shapes
30. 30. Answer of 76cm²Area of compound shapes
31. 31. Answer of 19cm²Area of compound shapes
32. 32. Answer of 48cm²Area of compound shapes
33. 33. Answer of 36cm²Area of compound shapes
34. 34. Answer of 88cm²Area of compound shapes
35. 35. Answer of 64cm²Area of compound shapes
36. 36. Answer of 35cm²Area of compound shapes
37. 37. Answer of 136cm²Area of compound shapes