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Point M is the point of intersection of all the 3 medians of a triangle ∆ ABC. The median drawn from vertex A intersects the side BC at point D and the lengths of AD and BC are 21 cm and 24 cm respectively. What is the sum of the lengths of BD and MD ?

Question

Point M is the point of intersection of all the 3 medians of a triangle ∆ ABC. The median drawn from vertex A intersects the side BC at point D and the lengths of AD and BC are 21 cm and 24 cm respectively. What is the sum of the lengths of BD and MD ?

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Solution

In a triangle, the median divides the side into two equal parts and the centroid (the point of intersection of medians) divides the median in the ratio 2:1, where the larger part is towards the vertex.

Given that AD is the median, D is the midpoint of BC. Therefore, BD = DC = BC/2 = 24/2 = 12 cm.

Also, given that M is the centroid, it divides AD in the ratio 2:1. Therefore, AM:MD = 2:1. Since AD = 21 cm, we can say that AM = 2*(AD/3) = 2*(21/3) = 14 cm and MD = AD/3 = 21/3 = 7 cm.

The sum of the lengths of BD and MD is BD + MD = 12 cm + 7 cm = 19 cm.

This problem has been solved

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