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## Answers

In equilateral triangle all sides are equal so the altitude will be 15cm

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The Brainliest Answer!

**ABC is an equilateral triangle and so all the sides are equal.**

if we take half of the base = (10√3)/2

= 5√3

we know, ( pythagoras theorem)

Let b be the height or altitude.

Hypotenuse ² = a² + b²

or, (10√3)²= (5√3)² + b²

or, 300 = 75 +b²

or, 300 - 75 = b²

or, 225 = b²

or, b=√225

= √5*5*3*3

= 5*3

**= 15 cm**