Question

Do all isosceles triangles have 3 sides of equal length?

Answer 1

See below!

Explanation:

No, isosceles triangles have TWO sides of equal length, not 3.

A triangle with 3 equal sides is an equilateral triangle. (equi- means equal, and "lateral" means "sides".

Hope that helps!

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Answer 2

no

Explanation:

You want to know if all isosceles triangles have 3 congruent sides.

Isosceles triangle

An isosceles triangle has two (2) congruent sides. The third side may or may not be congruent to those two. If it is, the triangle is usually referred to as an equilateral triangle.

All equilateral triangles are isosceles, but not all isosceles triangles are equilateral.

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