pytha drill into lines of concurrency day 2

Hon Geom Drill #3.07 2/13/15

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Hon Geom Drill #3.07 2/13/15

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Hon Geom Drill #3.07 2/13/15

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Hon Geom Drill #3.07 2/13/15

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Hon Geom Drill #3.07 2/13/15

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Objective•STW prove and apply properties of perpendicular bisectors, angle bisectors, midsegments, and medians of a triangle

GSP Investigations!!!

•Pick a partner and you need a device between the two of you and a packet each.

Example 1: Using Properties of Perpendicular Bisectors

G is the circumcenter of ∆ABC. By the Circumcenter Theorem, G is equidistant from the vertices of ∆ABC.

DG, EG, and FG are the perpendicular bisectors of ∆ABC. Find GC.

GC = CB

GC = 13.4

Circumcenter Thm.

Substitute 13.4 for GB.

Use the diagram. Find GM.

GM = 14.5

MZ is a perpendicular bisector of ∆GHJ.

Use the diagram. Find GK.

GK = 18.6

Example 3A: Using Properties of Angle

Bisectors

MP and LP are angle bisectors of ∆LMN. Find the distance from P to MN.

P is the incenter of ∆LMN. By the Incenter Theorem, P is equidistant from the sides of ∆LMN.

The distance from P to LM is 5. So the distance from P to MN is also 5.

3. Lee’s job requires him to travel to X, Y, and Z. What construction should he use to find a house equal distance from all of his job sites.

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