In equilateral triangle,

- All sides are equal
- All angles all equal 60°

In equilateral ∆ ABC,

- AB = AC = BC
- ∠A = ∠B = ∠C = 60°

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But, why
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are
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all angles 60°?
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In equilateral triangle, all angles are equal.

Let ∠A = ∠B = ∠C = x

In ∆ABC

Sum of angles is 180°

∠A + ∠B + ∠C = 180°

x + x + x = 180°

3x = 180°

x = (180°)/3

x = 60°

So, ∠A = ∠B = ∠C = 60 °

Thus, all angles are 60°

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For equilateral triangle
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Perimeter = 3a

Check proof (link)

Area = √3/4 a^2

Check proof (link)