# interior angle

(redirected from Interior angles)
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Related to Interior angles: exterior angles
interior angle
Angles 3, 4, 5, and 6 are interior angles. Angles 3 and 6 are alternate interior angles, as are angles 4 and 5.

## interior angle

n.
1. Any of the four angles formed between two straight lines intersected by a third straight line.
2. An angle formed inside a polygon by two adjacent sides.

## interior angle

n
1. (Mathematics) an angle of a polygon contained between two adjacent sides
2. (Mathematics) any of the four angles made by a transversal that lie inside the region between the two intersected lines

## inte′rior an′gle

n.
1. an angle formed between parallel lines by a third line that intersects them.
2. an angle formed within a polygon by two adjacent sides.

## in·te·ri·or angle

(ĭn-tîr′ē-ər)
1. Any of the four angles formed inside two straight lines when these lines are intersected by a third straight line.
2. An angle formed by two adjacent sides of a polygon and included within the polygon. Compare exterior angle.
ThesaurusAntonymsRelated WordsSynonymsLegend:
 Noun 1 interior angle - the angle inside two adjacent sides of a polygoninternal angleangle - the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radiansreentering angle, reentrant angle - an interior angle of a polygon that is greater than 180 degrees
References in periodicals archive ?
What do the interior angles of a square add up to in degrees?
The interior angles follow the pattern (n--2)(180[degrees])/n, where n is the number of sides.
For example, regardless of the types of quadrilaterals, their interior angles always add to 360[degrees].
Since m[angle]DPQ = m[angle]PQR, (because trapezium PQC'D' is a reflection of trapezium PQCD along the line segment PQ) and m[angle]DPQ = m[angle]RPQ (because alternate interior angles are congruent when a transversals intersects two parallel lines), APQR is an isosceles triangle with m[angle]PQR = m[angle]RPQ.
Perhaps, if we could have such an acquaintance, we could know directly and unhypothetically that its interior angles sum to two right angles.