Question

1. in an isosceles triangle, how many sides have the same length? 3 1 none of them 2

Explanation:

An isosceles triangle is defined as a triangle with at least two sides of equal length. By the definition of an isosceles triangle, we know that it has two sides with the same length (a triangle with three equal sides is equilateral, which is a special case of isosceles, but the basic definition requires at least two equal sides). So we analyze each option: 3 sides equal is equilateral (a type of isosceles but the question is about the general isosceles, and the options seem to present the non - special case understanding here), 1 side equal or none don't fit the definition. So the correct number of sides with the same length in an isosceles triangle (non - equilateral considered here as per the options) is 2.

Answer:

D. 2 (assuming the options are labeled as A. 3, B. 1, C. None of them, D. 2)