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 H is for ...
 1/2halfWhen something is divided into two equal parts, each of these two parts is half of the original object. Half can be written as 0.5 or 1/2. half moonA half moon looks like half a circle. hectogonA hectogon is a hundred-sided figure. hemisphereA hemisphere is half of a sphere.
 hendecagonA hendecagon is an eleven-sided figure (undecagon is another word for this figure). The Canadian one dollar coin (also called the loonie) is a regular hendecagon. heptagonA heptagon is a seven-sided figure. hexaflexagonA hexaflexagon is a folded geometric figure that can be "flexed" to expose its many sides. hexagonA hexagon is a six-sided figure. Beehives have hexagonal cells.
 hexagonal prismA hexagonal prism is a geometric solid (but not a Platonic solid) that has eight faces; each end is a hexagon, and the six other faces are rectangles. hieroglyphicsThe ancient Egyptians wrote using hieroglyphics. histogramA histogram is a block-style graph that presents frequency data in statistics. hourThere are 24 hours in a day.
 hour handAn hour hand on a clock tells you what hour it is. 100hundredOne hundred is the number between 99 and 101. A hundred-sided figure is called a hectogon. HypatiaHypatia of Alexandria (AD 370(?)-415) was a Greek mathematician, astronomer, teacher, and head of the Platonist school at Alexandria about AD 400. Hypatia wrote commentaries on the astronomical canon of Ptolemy and did work on conic sections . Her works are lost, but are referred to in the Suda lexicon. She was the daughter of the mathematician and philosopher Theon of Alexandria (he was also the last head of the Museum at Alexandria). A pagan, she was murdered in 415 by Christian monks in a religious/political struggle. The lunar Crater Hypatia and Rimae Hypatia were named for her. hyperbolaA hyperbola is a conic section (the intersection of a cone with a plane) that has two mirror-image branches. Hyperbolas have an eccentricity greater than 1.
 hypotenuseThe hypotenuse is the longest side of a right triangle, the side opposite the right angle.

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