6. Construct circumcentre of a triangle

Construct the circumcentre of the $ΔABC$ with $AB =5 cm$, $∠A = 60°$ and $∠B = 80°$. Also draw the circumcircle and find the circumradius of the $ΔABC$.

 

 

 

Step 1: Draw $ΔABC$ with the given measurements.

Step 2: Build a perpendicular bisector along both side ($AC$ and $BC$) and let it meet at $S$, which is the circumcenter.

Step 3: $S$ as center and $SA = SB = SC$ as radius, draw the circumcircle to pass through $A$, $B$ and $C$. And the circumradius measured $= 3.9 cm$.