# interior angle

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Related to interior angle: exterior angle

## interior angle

1. an angle of a polygon contained between two adjacent sides
2. any of the four angles made by a transversal that lie inside the region between the two intersected lines
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

## interior angle

[in′tir·ē·ər ′aŋ·gəl]
(mathematics)
An angle between two adjacent sides of a polygon that lies within the polygon.
For a line (called the transversal) that intersects two other lines, an angle between the transversal and one of the two lines that lies within the space between the two lines.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Teacher: (Indicating the interior angle) I always thought it referred to this part.
An interior angle is an angle that measures the angle between two adjacent sides of a polygon.
Luke then calculated that the large interior angle was 360[degrees] -- 108[degrees], or 252[degrees].
TIP It is important to remember that the angle AB:N is not included in the summation as it is not an interior angle. This angle is used to orient the traverse to North.
###vertically opposite angles and interior angles on the same
Caption: Students measuring interior angles of a regular octagonal building.
Small letters denote the sum of the interior angles in triangles and quadrilaterals.
All students were given the exact instructions on using pattern blocks to understand the relationship of interior angles in various polygons.
For this paper a triangle preserving function (TPF) is a continuous function f : (0,[pi]) [right arrow] [R.sup.+] which satisfies the property that for any triangle T with interior angles [alpha], [beta] and [gamma], there exists a triangle T* whose sides have lengths f([alpha]), f([beta]) and f([gamma]).
(5) Why is the sum of the measures of the interior angles of a triangle 180[degrees]?
"Yes, the Sum of the INterior angles and the Sum of the EXterior angles of a polygon!"
The tension tie-beam is of bolted construction, consisting of two flange and two web plates connected by continuous interior angles. Access for maintenance inspection is through hatches provided in the rib webs and in the ends of the tie girders.

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