Answer:
Verified
Step-by-step explanation:
Use
,
and 
LHS=
=RHS
<span>The distance from the vertex to the centroid is twice the distance from the centroid to the side.
This means that 3x + 5 = 2 * (2x)
</span><span>3x + 5 = 4x
x = 5
Source:
http://www.1728.org/trictr.htm
</span>
Answer:

Step-by-step explanation:

Hope this helps!
Figure A is 319.5 and figure B is 315 so I subtracted and got 4.5 so the answer is C