Only two equal side lengths
Isosceles.
A triangle with 2 equal side lengths is called an isosceles triangle.
You must have more information to determine what type of triangle it is. If two of the lengths are equal, it is isosceles. If all three of the lengths are equal, it is equilateral. If none of them are equal, it is scalene. It may also be a right triangle if it is isosceles or scalene.
A triangle with two equal side lengths is an isosceles triangle.
A triangle with no equal side lengths is a scalene triangle.
Only two equal side lengths
Lengths of: equal side+equal side+base = perimeter
Isosceles.
A triangle with 2 equal side lengths is called an isosceles triangle.
I would place this triangle in the category of isosceles triangles, because the 10m side and the 10m side have equal lengths.
You must have more information to determine what type of triangle it is. If two of the lengths are equal, it is isosceles. If all three of the lengths are equal, it is equilateral. If none of them are equal, it is scalene. It may also be a right triangle if it is isosceles or scalene.
A triangle with two equal side lengths is an isosceles triangle.
Use a ruler and measure one side only. All sides will measure the same if the triangle is equilateral.
An isoceles triangle has 2 congruent sides of equal length, and one of a different length.(If all three side lengths are the same, you have an equilateral triangle, which is also equiangular, each angle 60°).
a double triangle
That depends on what the side lengths are. Until the side lengths are known, the triangle can only be classified as a triangle.