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

Polygons

Polygons

Types of Polygons

Interior Exterior of Polygons

Sides, vertices and diagonals

Question 1 (a) Important Deleted for CBSE Board 2024 Exams

Convex and Concave Polygons

Ex 3.1, 1

Regular and Irregular Polygons

Ex 3.1, 2

Angle sum property of polygons

Question 2 Important Deleted for CBSE Board 2024 Exams

Question 3 Deleted for CBSE Board 2024 Exams

Question 4 (a) Deleted for CBSE Board 2024 Exams

Question 5 (a) Deleted for CBSE Board 2024 Exams You are here

Last updated at May 29, 2023 by Teachoo

Ex 3.1, 7 (a) Find x + y + zGiven, ∠PAR = x ∠BAC = 90° ∠ABC = 30° ∠ABQ = Z ∠BCR = y PAB is a line ∠PAR + ∠BAC = 180° x + 90° = 180° x = 180° − 90° x = 90° QBC is a line ∠ABQ + ∠ABC = 180° z + 30° = 180° z = 180° − 30° z = 150° In ∆ ABC Sum of the angles = 180° ∠BAC+ ∠ABC + ∠ACB = 180° 90° + 30° + ∠1 = 180° 120° + ∠1 = 180° ∠ 1 = 180° − 120° ∠ 1 = 60° Now, AR is a line ∠BCR + ∠ACB = 180° y + 60° = 180° y = 180° − 60° y = 120° Thus, x = 90° , y = 120° , z = 150° Hence, x + y + z = 90° + 120° + 150° = 360°