Length of Latus Rectum in Ellipses: A Geometric Proof

  • Thread starter Thread starter DarkAnt
  • Start date Start date
  • Tags Tags
    Conics
Click For Summary
SUMMARY

The length of the latus rectum in an ellipse is definitively calculated using the formula 2b²/a, where 'b' represents the semi-minor axis and 'a' represents the semi-major axis. A latus rectum is defined as a line segment that passes through a focus of the ellipse and is perpendicular to the major axis, resulting in two latus recta for each ellipse. This geometric proof emphasizes the relationship between the axes and the properties of ellipses, providing a clear method for determining the length of the latus rectum.

PREREQUISITES
  • Understanding of ellipse geometry
  • Familiarity with the concepts of semi-major and semi-minor axes
  • Basic knowledge of trigonometry
  • Ability to perform algebraic substitutions in geometric formulas
NEXT STEPS
  • Study the derivation of the latus rectum formula in ellipses
  • Explore the properties of ellipses and their foci
  • Learn about the relationship between the axes of ellipses and their geometric implications
  • Investigate applications of latus rectum in real-world scenarios, such as optics
USEFUL FOR

Mathematicians, geometry students, educators teaching conic sections, and anyone interested in the properties of ellipses and their applications in various fields.

DarkAnt
Messages
195
Reaction score
0
"A line segment through a focus with endpoints on the ellipse and perpendicular to the major axis is a latus rectum of the ellipse. Therefore, an ellipse has two latus recta. Show that the length of each latus rectum is 2b^2/a."

I've been stuck on this for a little while now. Can anyone point me in the right direction?
 
Physics news on Phys.org
Draw an ellipse, show the relationships of A and B, do a little trig...
 
Substitute x = ae find y coordinate 2y will be the length of rectum
 
Thank you :smile:
 

Similar threads

Replies
4
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
3
Views
4K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 1 ·
Replies
1
Views
4K
  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K