Construct triangle LMN, in which ∠L= 120°, LM = 4 cm., and LN = 5 cm.
Step1: Construct segment LN = 5 cm

Step2: Draw a ray at angle 120° from point L

Step3: Using scale mark a point M at distance of 4 cm from point L on the ray drawn in step2

Step4: Draw line MN and our required ΔLMN is ready

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