Steps of Construction :
(1) Draw a line segment AB = 5.4 cm.

(2) At A construct an angle ∠A = 30°.
(3) At B construct an angle ∠B = 90°.
(4) AD and BE intersect each other at C.
(5) ∴ ΔABC is the required triangle.
(6) On measuring ∠C = 60° side BC = 31 cm.