Perpendicular Bisector of a triangle

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Homework Help Overview

The discussion revolves around the geometric properties of a triangle, specifically focusing on the perpendicular bisector of one of its sides, BC. Participants are attempting to clarify the relationship between the bisector and the extended sides of the triangle.

Discussion Character

  • Conceptual clarification, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are exploring how the perpendicular bisector of BC intersects the extended line CA and questioning the placement of points P and Q in their diagrams. There is also an attempt to calculate the length of PQ using trigonometric relations.

Discussion Status

The discussion is active, with participants providing clarifications on the geometric setup and questioning the accuracy of their diagrams. Some guidance has been offered regarding the interpretation of the problem statement, but there is no explicit consensus on the correct placement of points or the calculations involved.

Contextual Notes

Participants are working under the constraints of a textbook problem, which may have led to confusion regarding the diagram and the expected answers. There is mention of specific measurements and angles that are critical to the problem but may not align with the textbook's solutions.

nmnna
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Homework Statement
##ABC## is a triangle such that ##\angle ABC = 37^{\circ}15'##, ##\angle ACB = 59^{\circ}40'##, ##BC = 8## cm; the perpendicular bisector of ##BC## cuts ##BA##, ##CA## produced at ##P, \ Q##. Find the length of ##PQ##.
Relevant Equations
##\tan(\alpha) = \frac{opposite \ side}{adjacent \ side}##
Here is my attempt to draw a diagram for this problem:
1617268604102.png

I'm confused about the "the perpendicular bisector of ##BC## cuts ##BA##, ##CA## produced at ##P, \ Q##" part of the problem.
How does perpendicular bisector of ##BC## cut the side ##CA##?
 
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It cuts CA produced. Extend the line CA until it meets the bisector. That point is Q (not where you have put it).
 
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mjc123 said:
It cuts CA produced. Extend the line CA until it meets the bisector. That point is Q (not where you have put it).
Thank you
 
mjc123 said:
It cuts CA produced. Extend the line CA until it meets the bisector. That point is Q (not where you have put it).
1617290558617.png

I changed my diagram.
Now I have the right triangle ##\triangle PQC##, where ##CP = 4##cm (since ##PQ## is a perpendicular bisector), ##\angle QCP = 59^{\circ}40'##, so I can find ##PQ## using the relation $$\tan\angle QCP = \frac{PQ}{CP}$$
I got ##\approx 6.818## which is not the answer given in my textbook. Where did I go wrong?
 
Last edited:
nmnna said:
View attachment 280723
I changed my diagram.
Now I have the right triangle ##\triangle PQC##, where ##CP = 4##cm (since ##PQ## is a perpendicular bisector), ##\angle QCP = 59^{\circ}40'##, so I can find ##PQ## using the relation $$\tan\angle QCP = \frac{PQ}{CP}$$
I got ##\approx 6.818## which is not the answer given in my textbook. Where did I go wrong?
The description seems confusing to me as well.
Could it be that point P should be located where the perpendicular bisector of BC cuts BA?
What is the answer given in your textbook?
If it is close to 3.75 cm, then your last diagram is not correct regarding location of P.
 
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P is the point you have called L. The original statement, which is perhaps not as clear as it might be, means "the perpendicular bisector of BC cuts BA at P and cuts CA produced at Q."
 
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mjc123 said:
P is the point you have called L. The original statement, which is perhaps not as clear as it might be, means "the perpendicular bisector of BC cuts BA at P and cuts CA produced at Q."
Thank you for your help.
 

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