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Effectus [21]
3 years ago
10

Given △ABC, AD and BE are medians, AD ∩BE=G. Prove: GD/AG = DE/AB

Mathematics
1 answer:
saw5 [17]3 years ago
3 0

Answer:

See explanantion

Step-by-step explanation:

Since AD and BE are medians, then points D and E are midpoints of the sides BC and AC, respectively. Thus, segment DE is triangle's midline. By the Triangle midline theorem, DE is parallel to the side AB. Thus,

  • \angle ABE\cong \angle BED;
  • \angle BAD\cong \angle EDA

as alternate interior angles.

Moreover, \angle BGA\cong \angle EGD as vertical angles.

This gives us that triangles ABG and DEG are similar by AAA postulate.

Hence,

\dfrac{AB}{ED}=\dfrac{AG}{GD}

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