Check sibling questions

Question 3 - Polygons - Chapter 3 Class 8 Understanding Quadrilaterals

Last updated at May 29, 2023 by

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

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Book a free demo

Transcript

Question 3 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

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.