PR : RQ = 1 : 3
PR = 6 cm
The line segment in a triangle joining the midpoint of any two sides
is parallel to its third side and is also half of the length of the third side.
Calculation:
PR : PQ = 1 : 3
1 unit = 6 cm
PQ = 4 units = 4 × 6 = 24 cm
Then the value of BC = 24×2 = 48 cm
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