(21)
from the details given in the triangle:
TrianglePQR, PS and RT are median
If RT = 24,
we should find RU
from the triangle, that U is the centroid
we have median in the ratio 2:3
recall, that RT = 24
The centroid divide the median in the ratio 2:3
The shortest part get the ratio 2
While the longest part get the ratio 3
to get RU, we need to get the total ratio
Total ratio = 2 + 3 = 5
RU = ratio of RT divide by total ratio and multiply by length of RT
Then RU = 3/5 x 24
= 14.4
Therefore, RU = 14.4