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www.reference.com/world-view/factor-pairs-72-a2cc51e8c44c63ce

The factor pairs of 72 are 1 x 72, 2 x 36, 3 x 24, 4 x 18, 6 x 12 and 8 x 9. The product of each of these number pairs is 72.

www.reference.com/article/muscles-arranged-pairs-14a0984621ae00f0

Muscles are arranged in pairs on the skeleton in order to allow extension and contraction of body parts. According to the BBC, skeletal muscles can only pull in one direction.

www.reference.com/article/examples-synonym-pairs-eac03d989f434f9a

"Beautiful and attractive," "honest and honorable," and "lazy and idle" are several examples of synonym pairs. Synonym pairs, which are two words that mean roughly the same thing, can be composed of words from any of the eight parts of speech as long as the two words are from the same part of speech

www.reference.com/world-view/linear-pair-ca95bac022cd3959

A linear pair is a geometric term for two intersecting lines with a 180-degree angle. It is also known as a conjecture, or hypothesis, of linear pairs. Linear pairs require unshared sides of the angles to create rays on opposite sides.

www.reference.com/article/au-pair-4363dc2bcde63635

An au pair is a young person who travels abroad to stay with a host family and carry out duties such as looking after children and doing housework. The phrase is of French origin and means "by mutual agreement."

www.reference.com/science/complementary-base-pairing-868642d6c95f8b00

Complementary base pairing refers to the structural pairing of nucleotide bases in deoxyribonucleic acid, which is commonly known as DNA. DNA is made up of four nucleotide bases, each of which pairs with only one of the other bases.

www.reference.com/article/shape-two-pairs-parallel-sides-f58fb642e4c2b3b1

There are four variations of quadrilaterals that have two pairs of parallel sides: rhombuses, parallelograms, squares and rectangles. They are each differentiated by their relative side lengths and angles.

www.reference.com/article/invented-first-pair-scissors-c3405ce15b39d579

It is not known who first invented scissors. Scissors are estimated to have been invented about 1500 B.C. in ancient Egypt. The first scissors were the spring scissor type and were made of a single piece of metal with blades that were connected by a flexible metal strip.

www.reference.com/science/simple-machines-make-up-pair-scissors-21527df17e388848

Scissors are composed of two different types of simple machines: wedge and lever. The scissors' blades are sharpened into wedges, and the arms that are squeezed together are levers.

www.reference.com/article/famous-pairs-d7f85e9f32828320

Some famous pairs include Angelina Jolie and Brad Pitt, Kermit the Frog and Miss Piggy, Hester Prynne and Arthur Dimmesdale, Beyonce Knowles and Jay-Z, and Kurt Cobain and Courtney Love. Dynamic duos come in all forms, from romantic to doomed and fictional to startlingly real.