If you asking where you'd find them in the real world - Binoculars and telescopes are two examples.
There is no such thing as a "triangular" number (as a number), a triangular number or triangle number counts the objects that can form an equilateral triangle. One object can and Three objects can but not Two objects.
prism
A triangular number or triangle number counts the objects that can form an equilateral triangle. 10 objects can be formed into an equilateral triangle.
Real-world objects are tangible items that exist in the physical world and can be perceived through the senses. They include everything from everyday items like furniture and vehicles to natural elements such as trees and rocks. These objects can be interacted with, measured, and observed, distinguishing them from abstract concepts or digital representations. In various fields, understanding real-world objects is essential for practical applications, such as engineering, design, and environmental studies.
roof
Some of the pyramids in Antarctica resemble a triangular pyramid.
Roof of a house
If you asking where you'd find them in the real world - Binoculars and telescopes are two examples.
tent
what is the study of the design, form and function of objects in the real world
There is no such thing as a "triangular" number (as a number), a triangular number or triangle number counts the objects that can form an equilateral triangle. One object can and Three objects can but not Two objects.
Tent.
prism
a tent
Toblarone
A triangular number or triangle number counts the objects that can form an equilateral triangle. 10 objects can be formed into an equilateral triangle.