1.

Find the length of the line segment PQ when a = 3 cm.

Answer»

From the figure, 

Given PR = 3a and RQ = 2a 

PQ = PR + RQ 

= 3a + 2a 

= (3 + 2)a 

PQ = 5a 

If a = 3 cm, then PQ = 5(3) 

∴ PQ = 15 cm



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