NCERT Class 7 Mathematics Solutions: Chapter 6 –The Triangle and its Properties Exercise 6.3 Part 1

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Triangle made with 50 degree and 70 degree angle

Isosceles Triangles

1. Find the value of unknown x in the following diagrams:

Triangle ABC Are Given

Triangle PQR

Triangle XYZ

Isosceles Triangle Are Given

Given Triangle is Equilateral Triangle

Given Right Angled Triangle

Answer:

(i) In

[By angle sum property of a triangle]

(ii) In

[By angle sum property of a triangle]

(iii) In

[By angle sum property of a triangle]

(iv) In the given isosceles triangle

[By angle sum property of a triangle]

(v) In the given equilateral triangle

[By angle sum property of a triangle]

(vi) In the given right angled triangle

[By angle sum property of a triangle]