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Area of rectangles and triangles
This document provides an entry activity on calculating area. It includes key words and definitions for area, perimeter, shapes like rectangles, squares, triangles, and parallel lines. It then outlines learning objectives on calculating area of squares, rectangles, triangles and compound shapes at different levels. Sample problems are provided for each level along with progress sheets to check off objectives and practice questions to calculate area of various shapes.
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Area of rectangles and triangles
- 1. Entry Activity Lookat the cards on your desk. In pairs discuss match the key words to the definitions.
- 2. The space insidethe shape Area Remember: The grass inside a field The length around the outside of a shape Perimeter Remember: The fence around the field A four sided shape, two sets of parallel sides, two pairs of Rectangle 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 straight Triangle This shows a measurement of area cm² A shape with only straight sides Polygon Side by side and having the same distance Parallel continuously between them
- 3. • I willlearn 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. I will learnto calculate the area of squares and rectangles by counting squares Level 3
- 5. I will learnto calculate the area of squares and rectangles by counting squares Level 3
- 6. • I willlearn 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. I will learnto calculate the area of squares and rectangles using lengths Level 4 9 cm
- 8. I will learnto 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. • I willlearn 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. I will learnto calculate the area of a triangle Level 5
- 11. I will learnto calculate the area of a triangle Level 5
- 12. I will learnto calculate the area of a triangle Level 5
- 13. • I willlearn 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. Challenge Objective: Iwill learn to calculate the area of compound shapes Level 5+ 10cm 2cm Rectangle A 4cm Rectangle B 3cm
- 15. Challenge Objective: Iwill learn to calculate the area of compound shapes Level 5+
- 16. Challenge Objective: Iwill learn to calculate the area of compound shapes Level 5+ 76cm² 19cm² 16cm² 36cm² 88cm² 48cm²
- 17. Challenge Objective: Iwill learn to calculate the area of compound shapes Level 5+
- 18. Challenge Objective: Iwill learn to calculate the area of compound shapes Level 5+ 64cm² 64cm² 35cm² 136cm²
- 19. Progress Sheet I cancalculate 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. Red Question Calculate thearea of the shape below
- 21. Pink Question Calculate thearea of the shape below
- 22. Salmon Question Calculate thearea of the shape below
- 23. Purple Question Calculate thearea of the shape below
- 24. Yellow Question Calculate thearea of the shape below
- 25. Gold Question Calculate thearea of the shape below
- 26. Mint Question Calculate thearea of the shape below
- 27. Blue Question Calculate thearea of the shape below
- 28. Green Question Calculate thearea of the shape below
- 29. Answer of 16cm² Areaof compound shapes
- 30. Answer of 76cm² Areaof compound shapes
- 31. Answer of 19cm² Areaof compound shapes
- 32. Answer of 48cm² Areaof compound shapes
- 33. Answer of 36cm² Areaof compound shapes
- 34. Answer of 88cm² Areaof compound shapes
- 35. Answer of 64cm² Areaof compound shapes
- 36. Answer of 35cm² Areaof compound shapes
- 37. Answer of 136cm² Areaof compound shapes
Editor's Notes
- #11 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.