0:00 - Introduction 07:06 - Question 1: The angles of a triangle are x, 2x and 3x. Find the value of x in degrees. 08:20 - Question 3: In a right-angled triangle, one of the acute angles is 20 degrees greater than the other, find the angles of the triangle. 10:19 - Question 5: Find the interior angles of a regular polygon which has (a) 6, (b) 10, (c) 20 sides. 14:47 - Question 7: A regular polygon has angles of size 150 degrees each. How many sides has the polygon? 16:36 - Question 9: Four angles of a pentagon are equal and the fifth is 60 degrees. Find the equal angles and show that two sides of the pentagon are parallel. 20:28 - Question 11: In triangle ABC, the bisectors of angle B and angle C meet at I. Prove that angle BIC = 90 degrees + half angle A. 26:54 - Question 13: In the figure shown, line BX is the bisector or angle ABC and line CX is the bisector of angle ACB. If angle A = 68 degrees, find the size of the obtuse angle BXC. 28:38 - Question 15: A regular polygon has an angle of size 160 degrees each. How many sides does the polygon have? [n=18] Question 17: A regular polygon of n sides has each exterior angle to be 45 degrees. Find the value of n. 30:05 - Closing remarks Thanks for watching. Ask any questions in the comments. SUBSCRIBE for more videos. Like and share to help out the channel.
