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B, d, and f are the midpoints of each side and g is the centroid. find the following lengths.​

B, d, and f are the midpoints of each side and g is the centroid. find the following-example-1
User OverD
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1 Answer

4 votes

The solutions for the given triangle are:

GE = 10/3, BE = 5/3

GF = 32/3, CF = 16/3

AG = 10, GD = 20

GC = 3X/2, CF = X/2

X = 7, AD = 43

If BG=5, find GE and BE:

Since G is the centroid of the triangle, it divides each median (BG, CG, and AG) in a 2:1 ratio.

Therefore, GE = 2/3 * BG = 2/3 * 5 = 10/3 and

BE = BG - GE = 5 - 10/3 = 5/3.

If CG=16, find GF and CF:

Similarly, GF = 2/3 * CG = 2/3 * 16 = 32/3 and

CF = CG - GF = 16 - 32/3 = 16/3.

If AD=30, find AG and GD:

AG = 1/3 * AD = 1/3 * 30 = 10 and

GD = AD - AG = 30 - 10 = 20.

If GF=X, find GC and CF:

Since GF = 2/3 * GC, X = 2/3 * GC.

Solving for GC, we get GC = 3X/2.

Therefore, CF = CG - GF = 3X/2 - X = X/2.

If AG=9 =X, GD=5X-1, find X and AD:

We are given that AG = 9 and GD = 5X-1.

We also know that AG + GD = AD.

Substituting the first two equations, we get 9 + 5X-1 = AD.

Simplifying the equation, we get AD = 5X + 8.

Since AG = 1/3 * AD, we can also substitute the first equation to get 9 = 1/3 * (5X + 8).

Solving for X, we get X = 7.

Therefore, AD = 5 * 7 + 8 = 43.

User Patrick Bucher
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