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Ex 3.1, 4 - Examine the table (Each figure is divided into triangles

Ex 3.1, 4 - Chapter 3 Class 8 Understanding Quadrilaterals - Part 2
Ex 3.1, 4 - Chapter 3 Class 8 Understanding Quadrilaterals - Part 3


Transcript

Ex 3.1, 4 Examine the table. (Each figure is divided into triangles and the sum of the angles deduced from that.) What can you say about the angle sum of a convex polygon with number of sides? (a) 7 (b) 8 (c) 10 (d) n From the table, we observe that Sum of the angles = (n – 2) × 180° where n = number of sides. Number of Sides = n = 7 Sum of angles = (n − 2) × 180° = (7 − 2) × 180° = 5 × 180° = 900° (b) Number of Sides = n = 8 Sum of angles = (n − 2) × 180° = (8 − 2) × 180° = 6 × 180° = 1080° (c) Number of Sides = n = 10 Sum of angles = (n − 2) × 180° = (10 − 2) × 180° = 8 × 180° = 1440° (d) Number of Sides = n Sum of angles = (n − 2) × 180

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.