\( 1 \leftarrow \quad \) Select the correct choice that completes the sentence below. An equilateral triangle has \( \quad \nabla \) equal sides.

An equilateral triangle has three equal sides. This means that not only are the lengths of each side identical, but also each of the angles in the triangle measures 60 degrees! This unique property gives equilateral triangles a beautiful symmetry that is found in many natural and man-made structures, from the pyramids of Egypt to the design of the famous Eiffel Tower. The concept of equilateral triangles has been around for centuries, and they are considered one of the fundamental shapes in geometry. Ancient Greek mathematicians studied them extensively, and they played a key role in the development of geometric theories. Fun fact: The equilateral triangle is also a symbol of strength and stability, often used in architecture and design to convey these qualities.