Final answer:
A shape in geometry with three sides is called a triangle, and the sum of the interior angles in any triangle is always 180 degrees.
Step-by-step explanation:
The term for a shape in geometry that has three sides is a triangle. When thinking about a triangle, it is essential to consider it as a three-sided figure that lies flat on a plane. Additionally, the three interior angles of a triangle always add up to 180 degrees. An equilateral triangle is a special type of triangle where all three sides and all three angles are equal, each angle being 60 degrees. Another key point about triangles is their role in various structures and shapes, such as the icosahedron, which is formed from twenty equilateral triangles.