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Proposition 3 of Book IV in Euclid's Elements

(angle bisector theorem)

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7y ago

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Which of the following are reasons ised in the proof that the angle-bisector construction can be used to bisect any angle?

That one there!


Which of the following are reasons used in the proof that the angle bisector construction can be used to bisect any angle?

-CPTCP -SSS triangle congruence postulate -all of the radii of the circle are congruent apex :)


Divides an angle into two equal parts?

if u divide it into 2 equal parts its a half


Does the angle bisector in a triangle bisect the opposite side?

Not necessarily. The only time that the angle bisector would bisect the opposite side is if you were bisecting the vertex angle of an isosceles triangle.


Does a bisector cut an angle in half?

To bisect an angle is to divide the angle in half.


What are the reasons used in the proof that the angle-bisector construction can be used to bisect any angle?

The angle-bisector construction is proven effective by demonstrating that the two angles formed by the bisector are congruent. This is achieved using the properties of isosceles triangles, where the lengths of the sides opposite the equal angles are shown to be proportional to the lengths of the adjacent sides of the original angle. Additionally, the use of geometric tools like a compass and straightedge allows for the accurate replication of distances and angles, ensuring that the bisector divides the angle into two equal parts. Thus, the congruence of the resulting angles confirms that the construction reliably bisects any angle.


Will drawing an angle bisector always result in two acute angles?

Not if you bisect a reflex angle.


What is bisector of an angle?

Bisector of an angle in basically a line which is drawn from the vertex of the angle and bisect's or cuts the angle into 2 halves. For example we have angle PQR and if we cut a bisector through it then like: QS then SQR = 1/2*PQR


How do you bisect an obtuse angle?

In the same way that you bisect an acute triangle. Alternatively, you could extend one of the rays of the obtuse angle so that you have an acute angle. Bisect that angle and then draw a perpendicular to the bisector of the acute angle through the vertex.


What are the similarities between angle bisector and perpendicular bisector?

Similarities between angle bisector and perpendicular bisector: Perpendicular bisector bisects a line segment into two equal parts at 90°. Angle bisector bisects an creating two congruent angles they both bisect into equal parts! =)


What does bisect mean in maths terms?

Bisect means to seperate or split something into equal parts , like an angle bisector splits an angle exactly in half


What is the missing justification in the proof of the angle bisector construction?

SSS - APEX