Question

Construct the circumcentre of the ∆ABC with AB = 5 cm, ∠A = 60° and ∠B = 80°, also draw two circumcircle and find the circum radius of the ∆ABC.

Answer 1

Rough Diagram

Step 1: Draw the ∆ABC with the given measurements.

Step 2 : Construct the perpendicular bisector of any two sides (AC and BC) and let them meet at S which is the circumcentre. 

Step 3 : S as centre and SA = SB = SC as radius, draw the Circumcircle to passes through A,B and C. 

Circumradius = 3.9 cm.