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A scalene triangle.

Scalene Triangle

A scalene triangle.

Finding the area of a triangle in terms of polar coordinates of its three vertices.

Triangle Area

Finding the area of a triangle in terms of polar coordinates of its three vertices.

A positive slope line making a 60 degree angle with the x-axis.

Straight Line

A positive slope line making a 60 degree angle with the x-axis.

Finding the equation of a circle with the origin as its center.

Circle Equation

Finding the equation of a circle with the origin as its center.

An inscribed triangle in a circle.

Particular Cases

An inscribed triangle in a circle.

A circle with part of a triangle inscribed in it. They are lying on a coordinate plane.

Coordinate Plane

A circle with part of a triangle inscribed in it. They are lying on a coordinate plane.

A circle and triangle situated on coordinate planes.

Circle

A circle and triangle situated on coordinate planes.

Mechanical drawing triangle.

Drawing Triangle

Mechanical drawing triangle.

Mechanical drawing triangle.

Drawing Triangle

Mechanical drawing triangle.

"So David and all the house of Israel brought up the ark of Jehovah with shouting, and with the sound of the trumpet." 2 Samuel 6:15 ASV <p>Illustration of King David marching before the ark, playing his harp. The priests and people march behind him, carrying the ark and playing trumpets and tambourines. A young boy marches and plays a triangle.

King David Takes the Ark of the Covenant to Mount Zion

"So David and all the house of Israel brought up the ark of Jehovah with shouting, and with the sound…

"A draftsman's instrument for ruling parallel lines. It consists of a triangle so attached to a straight-edge that it can be moved back and forth on it a distance predetermined by the adjustment of a set-screw. a, a straight-edge; b, triangle moving on <i>a</i> for a distance determined by the set of the micrometer scale <i>c</i>; d, spring for releasing triangle and keeping it in the end of its slot." -Whitney, 1889

Section Liner, A Draftsman's Tool

"A draftsman's instrument for ruling parallel lines. It consists of a triangle so attached to a straight-edge…