ICSE Class 10 Answered

Side of equilateral triangle is 4 units .

Hence vertices on x-axis are (0,0) and (4, 0)

if side of equilateral triangle is a , then its height is ( √3 / 2 )a

Hence height of given equilateral triangle is ( √3 / 2 ) × 4 = 2√3 unit 

Top vertex is just above the mid point of base .  Hence coordinate of top vertex is ( 2, 2√3 )