SUBJECT: MATHEMATICS GRADE 8 WEEK 6, LESSON 8 TOPIC: Measurement - Area and perimeter of 2-D shapes CONCEPTS AND SKILLS TO BE ACHIEVED By the end of the lesson, learners should be able to : use appropriate formulae to calculate the perimeter and area of squares, rectangles, triangles circles. RESOURCES DBE workbook 2(42-64), Sasol-Inzalo workbook 2 (53-66), textbook, pencil, eraser, calculators, graph paper, ruler( DVD GDE 20 08 2014) PRIOR KNOWLEDGE Properties of 2-D shapes Substitution Equations COMPONENTS TIME TASKS/ACTIVITIES CAPS REVIEW AND CORRECTION OF 4Mins 1. AB² = AC² - BC² KEYWORDS: HOMEWORK = 15² - 12² Squares = 225 - 144 Square roots = 81 inverse square Therefore, AB = 9 Therefore, area of the triangle = ¹/₂ × base × height = ¹/₂ × 12 × 9 = 54 cm² 2. Let r1 and r2 be the outer and inner radii of ring. Then 2πr1 = 308
SUBJECT: MATHEMATICS GRADE 8 WEEK 6, LESSON 8 TOPIC: Measurement - Area and perimeter of 2-D shapes CONCEPTS AND SKILLS TO BE ACHIEVED By the end of the lesson, learners should be able to : use appropriate formulae to calculate the perimeter and area of squares, rectangles, triangles circles. RESOURCES DBE workbook 2(42-64), Sasol-Inzalo workbook 2 (53-66), textbook, pencil, eraser, calculators, graph paper, ruler( DVD GDE 20 08 2014) PRIOR KNOWLEDGE Properties of 2-D shapes Substitution Equations COMPONENTS TIME TASKS/ACTIVITIES CAPS REVIEW AND CORRECTION OF HOMEWORK 4Mins 1. AB² = AC² - BC² = 15² - 12² = 225 - 144 = 81 Therefore, AB = 9 Therefore, area of the triangle = ¹/₂ × base × height = ¹/₂ × 12 × 9 = 54 cm² 2. Let r1 and r2 be the outer and inner radii of ring. Then 2πr1 = 308 KEYWORDS: Squares Square roots inverse square