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Depends from the given information.
For example, if it is given the measure of the angle base θ, and the length of the base b, the sum of the sides a of the isosceles triangle equals to
2a = b/cos θ
If it is given the measure of the angle base θ, and the length of the height h, the sum of the sides a of the isosceles triangle equals to
2a = 2h/sin θ
If it is given the measure of the vertex angle θ, and the length of the base b, the sum of the sides a of the isosceles triangle equals to
2a = b/sin θ/2
If it is given the measure of the vertex angle θ, and the length of the height h, the sum of the sides a of the isosceles triangle equals to
2a = 2h/cos θ/2
If it is given the length measures of the base b and the height h, the sum of the sides a of the isosceles triangle equals to
2a = √(h4 + b2) (from the Pythagorean theorem)
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What is the perimeter of a isosceles right triangle?
The perimeter of any triangle is the sum of its 3 sides.
Perimeter of isosceles triangle?
It is the sum of the lengths of its sides.
What is the sum of an isosceles triangle that has two sides with lengths of 4 and x?
55
Half the sum of degree-measures of the angles of an isosceles triangle is?
90° . That's true of any triangle. Doesn't have to be isosceles.
What is the sum of an isosceles triangle will be?
The sum of the 3 interior angles of any triangle add up to 180 degrees
