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Mathematics 19 Online
OpenStudy (anonymous):

Geometry help please? G is the incenter of Δ ABC. m∠A = 58 m∠B = 64 m∠C = 58 What is the m∠BCE? 36 27 32 29

OpenStudy (anonymous):

picture ina sec

OpenStudy (anonymous):

OpenStudy (anonymous):

How do I solve this?

OpenStudy (anonymous):

that can't be right i ended up with 119 :l

OpenStudy (anonymous):

What do you know about incenters?

OpenStudy (anonymous):

m∠A = 58 m∠B = 64 m∠C = 58 The triangle has it's 3 Medians marked(D,E,F). A median cut's exactly half way from a vertex to the opposite side... It bisects the line segment and angle. So angle BCE would be half of angle C's measurement.

OpenStudy (anonymous):

its 29?

OpenStudy (anonymous):

Yes.

OpenStudy (anonymous):

yea because it wants angle c... And C is bisected so its halfed

OpenStudy (nubeer):

i think angle at C is getting bisect.. which means its dividing the angle in half.. so just half the angle of C

OpenStudy (anonymous):

which is 29

OpenStudy (anonymous):

Exactly. :D

OpenStudy (anonymous):

thanks guys :)

OpenStudy (anonymous):

welcome (:

OpenStudy (anonymous):

yea it was 29 I just sent my quiz

OpenStudy (anonymous):

@jazy, the incenter is the intersection of the angle bisectors. The medians are not involved. "A median cut's exactly half way from a vertex to the opposite side... It bisects the line segment and angle." This statement is false.

OpenStudy (anonymous):

yes incenter is the bisectors and circumcenter is the perpandicular bisectors. I do not know where the medians are involved

OpenStudy (anonymous):

what is the median of a triangle?

OpenStudy (anonymous):

A median bisects a side of the triangle, but it doesn't necessarily also bisect the angle. |dw:1350322892891:dw|

OpenStudy (anonymous):

In triangle ABC (that I drew), AN is an angle bisector and passes through the incenter of the triangle. CM is a median and makes AM = MB. It is not also an angle bisector of ACB. ACM =/= MCB.

OpenStudy (anonymous):

lagged

OpenStudy (anonymous):

|dw:1350323109326:dw| correction to the drawing.

OpenStudy (anonymous):

I see so it intersects at the middle of a line but doesnt always bisect

OpenStudy (anonymous):

Medians bisect sides. The three medians intersect at the centroid. Angle bisectors bisect angles. The three angle bisectors intersect at the incenter.

OpenStudy (anonymous):

alright i got yea

OpenStudy (anonymous):

Play around over here for a while http://www.mathopenref.com/triangleincenter.html @jazy you too.

OpenStudy (anonymous):

k, thanks for the explanation @CliffSedge (:

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