Question

classify this triangle by its sides. isosceles but not equilateral scalene equilateral

Explanation:

Step1: Recall triangle classification by sides

A scalene triangle has all sides of different lengths. An isosceles triangle has at least two sides equal. An equilateral triangle has all three sides equal (so it's a special case of isosceles).

Step2: Analyze the triangle's markings

The triangle has two sides with double tick - marks (indicating they are equal) and one side with a single tick - mark (different from the double - ticked sides). So, two sides are equal, and the third is different.

Step3: Match with the options

• "scalene" is incorrect because scalene has all sides different, but here two sides are equal.
• "equilateral" is incorrect because equilateral requires all three sides equal, but here we have two equal and one different.
• "isosceles but not equilateral" is correct because it has two equal sides (so isosceles) and not all three equal (so not equilateral).

Answer:

isosceles but not equilateral