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91Ó°ÊÓ

The medians of â–µDEFare shown. Find the lengths indicated.

  1. EP=?
  2. PR=?
  3. If FT=9, then PT=?and FP=?

Short Answer

Expert verified

EP=10,PR=4,FP=6.

Step by step solution

01

Step 1. Given information:

Medians of triangleDEFare given:

FT=9

02

Step 2. Concept used:

We use basic geometric and angle concept.

03

Step 3. Applying the concept:

a.

From the figure, and the theorem 10.4,

PS=13ES,⇒ES=EP+PS.Now,ifEP=x,ES=x+5,⇒5=13(x+5),⇒15=x+5⇒ â¶Ä‰â¶Ä‰x=10⇒EP=10.

b.

From the figure, and the theorem 10.4,

DP=23DR,⇒DR=DP+PR.Now,ifPR=y,DR=8+y,⇒8=23(8+y),⇒24=16+2y,⇒2y=8,⇒ y=4,⇒PR=4.

c.

From the figure, and the theorem 10.4,,

FP:PT:FT=2:1:3.AnditisalsogiventhatFT=9,⇒PT:9=1:3,⇒ â¶Ä‰3PT=9,⇒ â¶Ä‰â¶Ä‰â€‰PT=93,⇒PT=3.SinceFP:9=2:3,⇒FP=23×9,⇒FP=183,⇒FP=6.

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