Tri - And Quad- : Prefixes And Suffixes Section

Tri- means three. Think of a tricycle. A tricycle has three wheels.

A square has four sides, a rectangle has four sides where opposing sides are even, a quadrangle has four angles (quad means four). The correct answer is a triangle. Generally thought to be a three sided figure, it could be accurate to say a three-angled figure.

Quadrapeds (quad=four, ped=feet) makes the question a true statement. Dogs, horses, and cows are all quadrapeds.

A race that combines three activities is a triatholon.
A dinosaur with three horns is a triceratops.
An animal with four feet such as a horse or cow is a quadraped (quad=four, ped=foot).
The correct answer is a three-legged stool or stand. (tri=three, pod=feet (legged))

quad=four, lingual=language speaking, thus quadralingual is the ability to speak four languages, not three. Three languages would be trilingual.

To cut into three parts is to trisect. (tri=three, sect=to cut)
Having or involving three sides, countries or parties is having a "trilateral" arraingement or agreement.
A group of three people or things is a trio.
The correct answer is three related movies, plays, or written literatures.

To multiply times four could make something a very large number. Take a horse which is a quadraped. If quad meant to multiply times four, then a horse would have by definition 16 feet. 4x4. Quad means four and if you look at the quadraped horse, it has four feet. Quad=four, ped=feet.