Special Right Triangles
45º-45º-90º

 

If we represent the legs of an
 isosceles right triangle by 1, we can use the Pythagorean Theorem to establish relationships between the lengths of the legs and the hypotenuse.  These "special" formulas allow us to quickly arrive at answers regarding the lengths of sides in this triangle.

There are two "special" formulas that apply ONLY to the 45º-45º-90º triangle.

 

45º-45º-90º (Isosceles Right Triangle)
"Special" Formulas

You must remember that these formulas can be used ONLY in a 45º-45º-90º triangle.

For more information and examples with 45º- 45º- 90º triangles, check out the
Math A page at:
 http://regentsprep.org/Regents/math/rtritrig/Ltri45.htm

 


Roberts