Proving the Cyclic Quadrilaterals in Altitudes Problem | Geometry Help

  • Thread starter Thread starter lolerlol
  • Start date Start date
  • Tags Tags
    Geometry
Click For Summary
SUMMARY

The discussion focuses on proving that the quadrilaterals ABDU, ACDV, and BX1UV are cyclic in the context of triangle ABC with a right angle at A. The problem involves constructing squares on the sides of the triangle and finding points of intersection. Key insights include the necessity of demonstrating that angle BUA equals angle BDA to establish the cyclic nature of quadrilateral ABDU. The discussion emphasizes the importance of visual representation and understanding the definition of cyclic quadrilaterals.

PREREQUISITES
  • Understanding of cyclic quadrilaterals and their properties
  • Familiarity with triangle geometry, particularly right triangles
  • Basic skills in geometric constructions and diagramming
  • Knowledge of angle relationships in triangles and cyclic figures
NEXT STEPS
  • Research the properties of cyclic quadrilaterals and their angle relationships
  • Learn about geometric constructions involving triangles and squares
  • Explore the use of geometric software for visualizing complex constructions
  • Study the implications of angle chasing in proving cyclicity in quadrilaterals
USEFUL FOR

This discussion is beneficial for geometry students, educators, and anyone interested in advanced geometric proofs and cyclic quadrilaterals.

lolerlol
Messages
4
Reaction score
0

Homework Statement



Let AD be and altitude of triangle ABC where angle A is 90 degrees.

Squares BCX1X2, CAY1Y2 and ABZ1Z2 are drawn outwards from the sides.

Let AX1 meet BY2 in U and AAX2 meet CZ1 in V

Prove that each of the quadrilaterals ABDU, ACDV and BX1UV is cyclic

Homework Equations





The Attempt at a Solution



I'm not sure where to start, but I've been given a clue

If angle BUA = angle BDA, the ABDU is cyclic
Let the point where BY2 meets AC be P
Consider triangles AUP and Y2CP
 
Physics news on Phys.org
Welcome to physics forums! As you may have noticed, this is a great place to discuss ideas and problems you may encounter, in math and science.

On your problem, I would start by re-reading this https://www.physicsforums.com/showthread.php?t=94381. There are many knowledgeable people here, who are willing to steer you towards a successful solution. But first, you need to try to do some work on your problem and show us.

I recommend drawing the problem out as you've described it. A large drawing is useful, since you should see separation of the lines you draw, more clearly. I would also recommend using a pencil with a good eraser and a straight edge for this part.
Next, post what you have drawn as an image.

Can you tell us what a cyclic quadrilateral is?
(hint: if you cannot find it in your text, look it up on the web).
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 28 ·
Replies
28
Views
4K
  • · Replies 17 ·
Replies
17
Views
3K
Replies
7
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
4
Views
4K
  • · Replies 3 ·
Replies
3
Views
4K