Step 1 : Introduction to the question "Which of these dinosaurs had three horn?"
The Triceratops is easily one of the most recognizable dinosaurs with its three horns and bony frill around the back of its head. Its name is a combination of the Greek syllables tri-, meaning "three," kéras, meaning "horn," and ops, meaning "face." This dinosaur roamed North America about 67 million years ago, during the end of the Cretaceous Period. It bore a single horn on the snout, above the nostrils, and a pair of horns approximately 3.3 feet long, with one above each eye. Almost one third of the length of the Triceratops was its skull. A typical Triceratops was approximately 26 feet long, while its skull was approximately 7 feet long.