Question

which triangle is an isosceles triangle? click on the correct triangle.

Explanation:

Step1: Recall Isosceles Triangle Definition

An isosceles triangle has at least two equal - length sides (marked by tick marks in diagrams).

Step2: Analyze Each Triangle

• First triangle: Has two sides with tick marks, indicating two equal sides.
• Second triangle: Is a right triangle, no equal - side markings.
• Third triangle: No equal - side markings.
• Fourth triangle: Is a scalene - looking (or obtuse) triangle with no equal - side markings.

Answer:

The first triangle (the left - most triangle with two sides marked as equal)