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

Triangle made with 50 degree and 70 degree angle

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

Triangle ABC Are Given

Triangle ABC, which is made 50 degree and 60 degree angle

Triangle PQR

Triangle PQR, which is made 30 degree and 90 degree angle

Triangle XYZ

Triangle XYZ, which is made 30 degree and 110-degree angle

Isosceles Triangle Are Given

Given Isosceles triangle is made with 50 degree

Given Triangle is Equilateral Triangle

Given triangle is equilateral triangle

Given Right Angled Triangle

Given right angled triangle made with 90 degree

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]