Step1: Draw a segment AB of length 12.6 cm

Step2: Draw a ray below AB at any angle from point A

Step3: Take any distance in compass and keep the needle of compass on point A and draw an arc intersecting ray drawn in step2. Name the intersection point as X₁. keeping the distance same in compass keep the needle on point X₁ and mark an arc intersecting the ray at X₂. Draw 7 such parts that is upto X_7. By doing this we are making 7 equal parts on the ray

Step4: Join X₇B and draw lines parallel to X₇B from X_1, X_2, X_3, X_4, X₅ and X₆ which intersect AB at A_1, A_2, A_3, A_4, A₅ and A₆

Measuring each part it is of length 1.8 cm

So length of 4 parts combined will be 7.2 cm

Using this we will construct the equilateral triangle of length 7.2 cm

Step5: Take distance AA₄ in compass. Keep the needle of compass on point A and mark an arc above AA₄

Step6: Keeping the distance in compass same as that of in step5 which is AA₄ keep the needle of compass on A₄ and mark arc intersecting arc drawn in step5 at C. Join AC and A₄C equilateral ΔAA₄C of side 7.2 cm is ready