Steps of construction :
(i) Draw a line segment BC = 6 cm.
(ii) At point B, make CBA = 55˚ and at point C, make an angle BCA = 70˚ with the help of a protractor. Join AB and AC.
(iii) Draw the perpendicular bisectors of sides AB and AC. Let them intersect at O.
(iv) With O as centre and radius OA, draw a circle which passes through the point A, B and C.
This is the required circumcircle of ABC.