Why Is the Angle Considered 90 Degrees?

  • Thread starter Thread starter Joza
  • Start date Start date
  • Tags Tags
    Degrees
Click For Summary
The discussion centers on the geometric reasoning behind why the angle is considered 90 degrees. It explains that line segment CE is parallel to line segment AB, while line segment AD is perpendicular to AB at point A. Consequently, this makes line segment AD also perpendicular to line segment EC at point E. The relationship between these segments establishes the right angle at E. Understanding these geometric principles clarifies why the angle is defined as 90 degrees.
Joza
Messages
139
Reaction score
0
http://www.e-xamit.ie/2005test/php/GetDocByID.php?id=562&prep=565&soln=562&tip=570&port=566


I can't figure out how it takes the angle dec to be 90 degrees? How?
 
Last edited by a moderator:
Physics news on Phys.org
Line segment ce is parallell to line segment ab. Line segment ad is perpendicular to ab at a, hence, ad is perpindicular to ec at e.
 

Similar threads

Undergrad How Can I Achieve a Non-Direct Reflection Effect on Plexiglass at 90 Degrees?
  • · Replies 18 ·
Replies
18
Views
2K
How does angle of pic provided equal a/2 + 90 degrees?
  • · Replies 5 ·
Replies
5
Views
3K
Angles inscribed in circles part 1
  • · Replies 6 ·
Replies
6
Views
2K
High School Why do we need angle values greater than 90 degrees?
  • · Replies 12 ·
Replies
12
Views
4K
High School How does wind affect a turn for an aircraft?
  • · Replies 16 ·
Replies
16
Views
3K
Critical angle (symmetry of refraction) confusion
  • · Replies 5 ·
Replies
5
Views
3K
Why Does arccos(x) - arcsin(1-x) Equal 90° Have No Solutions?
  • · Replies 42 ·
2
Replies
42
Views
6K
Translating reciprocating motion into a 45 degree rotation
  • · Replies 5 ·
Replies
5
Views
3K
High School Mastering Compound Angles for Perfect Molding Installation
  • · Replies 5 ·
Replies
5
Views
2K
Previous university exam problem on refraction (that I think is wrong)
  • · Replies 14 ·
Replies
14
Views
4K