Can’t find the length of a segment

[lofty flare]

#5

[crimson cargo]

how'd you get 2x+x = sqrt(180) ?

[lofty flare]

Something my teacher showed me but I don’t get it

[crimson cargo]

you can use this formula but idk if it's allowed

so a=4, c=14, and b=14

[crimson cargo]

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.cuemath.com/geometry/centroid-of-a-triangle/&ved=2ahUKEwjpqcqn8v3-AhV_m2MGHWHtAAoQFnoECCcQAQ&usg=AOvVaw2nH31xYSUEiTVpdll6Xb1L

centroid always lies 2/3 from a vertex

[crimson cargo]

if you want the prove here is it

https://www.quora.com/What-is-the-proof-for-the-property-of-the-centroid-of-a-triangle-that-divides-the-median-into-2-1

[lofty flare]

Ok thank you