Question

which triangle is equilateral?

Explanation:

Step1: Recall equilateral triangle definition

An equilateral triangle has all three sides equal and all three angles equal (each \(60^\circ\)). Visually, it appears "symmetric" with all sides looking the same length.

Step2: Analyze each triangle

• Top - left: Right - angled triangle (has a \(90^\circ\) angle), not equilateral.
• Top - right: Isosceles (maybe), but base looks longer than equal sides, not equilateral.
• Bottom - left: Scalene or isosceles, sides not all equal.
• Bottom - right: All sides appear equal in length, angles likely equal.

Answer:

The triangle in the bottom - right box (the last triangle) is equilateral.