In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or right angles).[1] It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices ABCD would be denoted â» {\displaystyle \square } ABCD.
Ever since they were invented, catapults have been a deadly war weapon. The catapult was invented by Dionysius of Syracuse around 400 B.C. In Greek, the word catapult means to throw into. When he designed the catapult, Dionysius wanted to create an effective war weapon. The first catapult designed worked like a crossbow. To be able to make the catapult more powerful, it was made larger and stronger and set on a tripod.
A catapult is a generic term for a machine that hurls an object. The earliest writings of catapults were that they originated in China around the 3rd and 4th Century BC and this type of catapult was much like a big crossbow. One type of catapult, the Mangonel could launch missiles across long distances. Mangonels fired heavy projectiles from a bowl-shaped bucket at the end of its arm. The Mangonel was used for aiming various missiles at castles, fortresses and cities. This type of catapult was easy to construct and wheels were added to the design to ensure maneuverability. The Mangonels were capable of firing projectiles up to 1,300 feet. Attackers used projectiles which would cause as much distress and discomfort inside the castle walls.