It is the sum of the lengths of its sides.
90° . That's true of any triangle. Doesn't have to be isosceles.
The perimeter of any triangle is the sum of its 3 sides.
the sum of the internal angles of a triangle, no matter whether isosceles, equilateral or scalene, is always 180 degrees
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It is the sum of the lengths of its sides.
90° . That's true of any triangle. Doesn't have to be isosceles.
The sum of all three interior angles of any triangle, isosceles or not, is 180 degrees.
The perimeter of any triangle is the sum of its 3 sides.
the sum of the internal angles of a triangle, no matter whether isosceles, equilateral or scalene, is always 180 degrees
The sum of the interior angles of a triangle is 180o. In an isosceles triangle two of the angles are the same, say x. The third angle is then 180o-2x.
If you mean "isosceles" triangle, the perimeter is the sum of twice the known side plus the base.
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Yes
An isosceles triangle has 3 interior angles that add up to 180 degrees, and 2 of its angles are equal and two of its sides are equal.
I don't see any isosceles triangle below.In general, the perimeter is the sum of the lengths of all sides. Note that in an isosceles triangle, two of the three sides have the same length.
The angle sum of any triangle is 180 degrees. It does not matter whether it is equilateral, isosceles or scalene, nor whether it is acute angled, right angled or obtuse angled (or any permitted combination).