An acute isosceles triangle
there is not one because a equilateral triangle is one triangle so the ansew is equilateral triangle
An obtuse triangle.
an equaladderal triangle
A right triangle
Your question contains the answer. It is a 'right' triangle.
A right-angled triangle.
That's called a "right triangle".
In an isosceles triangle, one of the medians is perpendicular to the opposite side of that triangle. In an equilateral triangle, all three medians are perpendicular to the sides of that triangle.
An obtuse triangle.
An isoscles triangle
An obtuse angled triangle.
Right Isosceles triangle