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Angles - Equilateral and isosceles triangles

An equilateral triangle has 3 equal sides and 3 equal angles.

A triangle with 3 equal sides and 3 equal angles

An isosceles triangle has 2 equal sides and 2 equal angles.

a triangle with two sides of equal length and two equal angles

Question

What is the size of angle p?

A triangle with 2 sides of equal length, and two angles the same size. On of these angles is labelled p. The third angle measures 40 degrees
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