"Perpendicular section of the fruit of Pyrus malus." -Lindley, 1853

Apple

"Perpendicular section of the fruit of Pyrus malus." -Lindley, 1853

Two apples. One is whole and the other is split in half.

Apples

Two apples. One is whole and the other is split in half.

Method to bisect an angle

Bisect An Angle

Method to bisect an angle

"The Galatea Butterfly, <em>P. Galatea</em>, A Euoprean species, called <em>The Half-Mourning Butterfly</em>, has the wings slightly denticulated; they are of a brownish-yellow, with the base and extremities black, and spotted with white." &mdash; Goodrich, 1859

Half-Mourning Butterfly

"The Galatea Butterfly, P. Galatea, A Euoprean species, called The Half-Mourning Butterfly,…

Illustration of equal circles to show that an inscribed angle is measured by half the arc intercepted between its sides.

Circles With Inscribed Angles

Illustration of equal circles to show that an inscribed angle is measured by half the arc intercepted…

"The contours of a half sphere are a series of circles, far apart near the center (top) and near together at the outside (bottom), showing that the slope of a hemisphere varies at all points, being nearly flat on top and increasing in steepness near bottom." &mdash; Moss, 1914

Contours of a half sphere

"The contours of a half sphere are a series of circles, far apart near the center (top) and near together…

"This will be understood [here] where the ray of light A B, proceeding from the eye, falls perpendicularly on the plane mirror B D. will be reflected back in the same line; but the ray C D coming from the feet, which falls obliquely on the mirror, will be reflected back under the same angle in the line D A; and since we see objects in the direction of the reflected rays, and the image appears at the same distance behind the mirror that is object is before it, we must continue the line A D to the feet, E, and for the same reason, the rays A B, from the eye, must be prolonged to F, as far behind the mirror as the line E extends, where the whole image will be represented." -Comstock 1850

Mirror Half the Length of the Object

"This will be understood [here] where the ray of light A B, proceeding from the eye, falls perpendicularly…

"Parted per pale, gules and argent. PARTY PER PALE. This signifies a shield parted by a perpendicular line down the centre, so that one shield may contain two coats of arms." -Hall, 1862

Party Per Pale

"Parted per pale, gules and argent. PARTY PER PALE. This signifies a shield parted by a perpendicular…

"One half of the permanent set of teeth." &mdash; Ritchie, 1918

Half set of permanent teeth

"One half of the permanent set of teeth." — Ritchie, 1918

A circle subdivided into four eighths and one half.

Four Eighths and One Half of a Pie Fraction

A circle subdivided into four eighths and one half.

One half of a circle (vertical left).

Half of a Fraction Pie

One half of a circle (vertical left).

One half of a circle (vertical right).

Half of a Fraction Pie

One half of a circle (vertical right).

One half of a circle (horizontal top).

Half of a Fraction Pie

One half of a circle (horizontal top).

One half of a circle (horizontal bottom).

Half of a Fraction Pie

One half of a circle (horizontal bottom).

A circle subdivided into one half and four eighths.

One Half and Four Eighths of a Pie Fraction

A circle subdivided into one half and four eighths.

A circle subdivided into one half and three sixths.

One Half and Three Sixths of a Pie Fraction

A circle subdivided into one half and three sixths.

A circle subdivided into one half and two quarters.

One Half and Two Quarters of a Pie Fraction

A circle subdivided into one half and two quarters.

A circle subdivided into one quarter, three twelfths, and one half.

One Quarter, Three Twelfths, and One Half of a Pie Fraction

A circle subdivided into one quarter, three twelfths, and one half.

A circle subdivided into one quarter, two eighths, and one half.

One Quarter, Two Eighths, and One Half of a Pie Fraction

A circle subdivided into one quarter, two eighths, and one half.

A circle subdivided into three sixths and one half.

Three Sixths and One Half of a Pie Fraction

A circle subdivided into three sixths and one half.

A circle divided in half vertically.

Two Halves of a Fraction Pie

A circle divided in half vertically.

A circle divided in half horizontally.

Two Halves of a Fraction Pie

A circle divided in half horizontally.

A circle divided in half vertically separated.

Two Halves of a Fraction Pie

A circle divided in half vertically separated.

A circle divided in half horizontally separated.

Two Halves of a Fraction Pie

A circle divided in half horizontally separated.

A circle subdivided into two quarters and one half.

Two Quarters and One Half of a Pie Fraction

A circle subdivided into two quarters and one half.

Illustration of 2 right rectangular prisms. The bases are congruent, but the height of the smaller prism is one half that of the larger. Hidden edges are shown.

2 Rectangular Prisms

Illustration of 2 right rectangular prisms. The bases are congruent, but the height of the smaller prism…

Illustration of 2 right rectangular prisms. The bases are congruent, but the height of the smaller prism is one half that of the larger.

2 Rectangular Prisms

Illustration of 2 right rectangular prisms. The bases are congruent, but the height of the smaller prism…

Illustration of a the bottom half of a regular dodecahedron. A regular dodecahedron is a polyhedron with twelve equal pentagonal faces.

Bottom Half of a Regular Dodecahedron

Illustration of a the bottom half of a regular dodecahedron. A regular dodecahedron is a polyhedron…

English ruler with half inch markings.

Half Inch Ruler

English ruler with half inch markings.