Isosceles Triangle
A Triangle with two equal sides (and two equal Angles). The name derives from the Greek iso (same)and skelos (Leg). The height of the above isosceles triangle can be found from the Pythagorean Theorem as
 | (1) |
 | (2) |
There is a surprisingly simple relationship between the Area and Vertex Angle 
. As shown in theabove diagram, simple Trigonometry gives
 |  |  | (3) |
 | |  | (4) |
so the Area is
 | (5) |
No set of 
points in the Plane can determine only Isosceles Triangles.
- Hyperbolic Spiral Roulette
- Hyperbolic Substitution
- Hyperbolic Tangent
- Hyperbolic Tetrahedron
- Hyperbolic Umbilic Catastrophe
- Hyperboloid
- Hyperboloid Embedding
- Hypercomplex Number
- Hypercube
- Hyperdeterminant
- Hyperellipse
- Hyperelliptic Function
- Hyperelliptic Integral
- Hyperfactorial
- Hypergeometric Differential Equation
- Hypergeometric Distribution
- Hypergeometric Function
- Hypergeometric Identity
- Hypergeometric Polynomial
- Hypergeometric Series
- Hypergroup
- Hypermatrix
- Hyperparallel
- Hyperperfect Number
- Hyperplane