Assuming that trignale is a curious way of spelling triangle,
isosceles means with equal legs from the Greek isos = equal and skelos = leg. The Greek isoskeles changed to the Latin isosceles and that is how it has remained.
There is no such thing as an isosceles rectangle.
Sides.
Isosceles.
Isosceles
Another name is its correct name: an isosceles triangle.
There is no such thing as an isosceles rectangle.
Isosceles mean having two sides of equal length.
It could be an isosceles triangle, an isosceles trapezium, or miscellaneous polygons with no special name.
The third angle of an isosceles triangle doesn't have a name.
The two equal length sides of an isosceles triangle are the legs.
Sides.
equilateral
An isosceles triangle.
Isosceles.
Isosceles
isosceles
an isosceles triangle