Angles of Isosceles Triangles

Last updated at July 27, 2026 by

[Maths] Angles of Isosceles Triangles - with Examples - Class 7 Part 2 - Angles of Isosceles and Equilateral Triangles

part 2 - Angles of Isosceles Triangles - Angles of Isosceles and Equilateral Triangles - Chapter 1 Class 7 - Geometric Twins (Ganita Prakash II) - Class 7 (Ganita Prakash 1, 2 & old NCERT)

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Angles of Isosceles Triangles∆ABC is isosceles with AB = AC, and ∠A = 80°. What can we say about ∠B and ∠C ? Let’s first draw the figure To solve this, we construct altitude from vertex A to BC Now, by Corresponding parts of Congruent Triangles (CPCT) ∠ ABD = ∠ ACD Thus, we can write ∠ B = ∠ C This is a Property of Isosceles Triangle In an Isosceles Triangle, Angle opposite to equal sides are equal

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