ANSWER
(a) DE is the shortest side of the median.
![DE=(1)/(3)CE](https://img.qammunity.org/2023/formulas/mathematics/college/h2ohjgfqg0ncms369quh9uz5xnvflckznw.png)
(b) DE = 5
Step-by-step explanation
The centroid is the point of congruence of all the medians of a triangle. The distance from the vertex to the centroid is 2/3 the lenght of the median and the distance from the centroid to the side of the triangle is 1/3 the lenght of the median.
DE is the segment from the centroid to the side of the triangle, so:
![DE=(1)/(3)CE](https://img.qammunity.org/2023/formulas/mathematics/college/h2ohjgfqg0ncms369quh9uz5xnvflckznw.png)
If CE = 15, then:
![DE=(1)/(3)*15=5](https://img.qammunity.org/2023/formulas/mathematics/college/c6uzjpyxfbc1lf906gra1sx817h49peiwn.png)