Answer :

Let the triangle be ΔABC with AB = 6 cm and BC = 7 cm


Now angle opposite to side with length 7 cm that is angle opposite to side BC is A which is 60°


So, if we draw it roughly it will look like



Let us construct the triangle now


Step1: Construct AB of length 6 cm



Step2: As A = 60° but we don’t know the length of AC so we will just draw a ray at angle 60°



Step3: As BC is 7 cm we will take 7 cm in compass, keeping the needle of compass on point B mark an arc intersecting the ray drawn in step 2 at point C.



Step4: Join BC and using scale measure the unknown length AC



AC is 7.7 cm


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