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![[Class 7 Part 2] Angles of Equilateral Triangles - with Examples - Angles of Isosceles and Equilateral Triangles](https://cdn.teachoo.com/9a627801-fd92-4dc5-90be-b6fcd61fc876/slide103.jpg)
Angles of Equilateral Triangles
Last updated at January 19, 2026 by Teachoo
Angles of Isosceles and Equilateral Triangles
Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 1 Class 7 - Geometric Twins (Ganita Prakash II)
- Introduction
- Figure it out - Page 3, 4
- Congruence of Triangles
- Figure it out - Page 8, 9
- Congruency involving Angles
- Figure it out - Page 14
- Other Congruencies
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Angles of Isosceles and Equilateral Triangles
- Congruent Triangles in Real Life
- Figure it out - Page 20, 21
Transcript
Angles of Equilateral TrianglesEquilateral triangles are those in which all the sides have equal lengths. What can we say about their angles? We can use the property Angles opposite to equal sides are equal Drawing figure Since AB = AC Angle opposite to them are equal ∴ ∠ C = ∠ B Similarly, Since AB = BC Angle opposite to them are equal ∴ ∠ C = ∠ A Thus, we can say ∠ A = ∠ B = ∠ C Now, By Angle sum property of Triangle ∠ A + ∠ B + ∠ C = 180° Since all angles are equal ∠ A + ∠ A + ∠ A = 180° 3 × ∠ A = 180° ∠ A = (180° )/3 ∠ A = 60° So, ∠ A = ∠ B = ∠ C = 60° Thus, all angles of an equilateral triangle are 60°
