# secÂ·tor

## Related Articles

- arc. // American Heritage Student Science Dictionary;2009, p20
A definition of the term "arc" is presented. It refers to a segment of a circle.

- THE UBIQUITOUS ISOSCELES TRIANGLE PART 2 -- CIRCLES. Perks, Pat; Prestage, Stephanie // Mathematics in School;Mar2006, Vol. 35 Issue 2, p27
Explores the expansion of the arc to a circle, in exploring the isosceles triangle. Consideration of the isosceles triangle in one circle; Hidden shapes used, such as the kite; Givens used in various illustrations.

- cirÂ·cle. // American Heritage Student Science Dictionary;2009, p70
A definition of the term "circle" is presented. It refers to a closed curve whose points are all on the same plane and at the same distance from a fixed point. A diagram of a circle is outlined.

- Questions Pupils Ask! Asking Questions. Foster, Colin // Mathematics in School;Sep2006, Vol. 35 Issue 4, p24
The article presents a question and answer related to geometry. One reader asks why the interior angle sum of a triangle adds up to 180 degrees when a square and circle total 360 degrees. The response compares it to the interior angles of a circle where the sum tends to infinity. The response...

- seÂ·cant. // American Heritage Student Science Dictionary;2009, p305
Several definitions of the term "secant" are presented. It refers to a straight line or ray that intersects a curve, especially a circle, at two or more points. It also refers to the ratio of the length of the hypotenuse in a right triangle to the side adjacent to an acute angle; the inverse of...

- segÂ·ment. // American Heritage Student Science Dictionary;2009, p306
Several definitions of the term "segment" are presented. Segment is the portion of a line between any two of its points. It can also refer to the region bounded by an arc of a circle and the chord that connects the endpoints of the arc. Segment is also the portion of a sphere included between a...

- triÂ·anÂ·gle. // American Heritage Student Science Dictionary;2009, p350
A definition for the term "triangle" is presented. It refers to a closed geometric figure consisting of three sides. Information regarding the calculation of the area of a triangle is mentioned.

- Journey to the centre of a triangle. Oldknow, Adrian // Micromath;Autumn2004, Vol. 20 Issue 3, p6
The article presents a mathematical exercise, which describes the geometry of triangles. According to the author, the ancient Greeks explored a geometry in which the basic building blocks were points, lines and circles lying in a plane. The first section of the article describes the three...

- CIRCUMSCRIBED SHAPES ARE ENLARGED: IS THIS A VARIATION OF THE DELBOEUF ILLUSION? Jaeger, Ted // Perceptual & Motor Skills;Jun2007 Part2, Vol. 104 Issue 3, p1116
Pairs of complex shapes, for example, two golf holes or two hands making a peace sign, were printed on cards with one of the two shapes surrounded by a circle. 20 participants judged the size of the unenclosed shapes relative to the size of the enclosed ones. For 12 pairs in which there were...