Correct Answer - Option 2 : a√3
Concept:
Altitude of an equilateral triangle = (√3/2) × side ------(1)
Area of an equilateral triangle = (√3/4) × (side)2
Calculation:
Given side of equilateral triangle = 2a
then from eqn (a),
Altitude of an equilateral triangle = (√3/2) × 2a = a√3