Question

construct an equilateral triangle ABC such as AB =4.2

Answer 1

Draw AB = 4.2 cm

Take 4.2 cm in compass and draw a arc from A
and other from B

mark the intersecting point as C

Join AC and BC

Now ABC is the required Triangle

Answer 2

Text 4.2 CM in compass and make the ARC and do same as in point B

Mark the intersecting point C

Join AC and BC

Now ABC is required Triangle