interior angles
Polygon's inner measurements
Interior angles are the angles formed inside a polygon where two sides meet, or the angles on the inner side of two lines crossed by a transversal.
In a triangle, the three interior angles always sum to 180 degrees; in any convex polygon, the sum follows a predictable formula based on the number of sides: The interior angles of a pentagon add up to 540 degrees.
Units of measurement
- protractorAngle-measuring instrument
- sumAddition's result
- 180Degrees in straight angle
- 360Full circular measure
acute · obtuse · complementary · supplementary · calculation · bisect · adjacent · trigonometry
Three-sided plane figure
- quadrilateralFour-sided closed figure
- pentagonFive-sided closed figure
- hexagonSix-sided closed figure
- octagonEight-sided polygon
nonagon · decagon · dodecagon · parallelogram · rhombus · trapezoid · equilateral · isosceles
Line crossing multiple others
- correspondingMatching in character
- alternateOccur in succession
- parallelEquidistant at all points
- perpendicularAt right angles
degrees
Units of measurement
- protractorAngle-measuring instrument
- sumAddition's result
- 180Degrees in straight angle
360 · acute · obtuse · complementary · supplementary · calculation · bisect · adjacent · trigonometry · theorem
triangle
Three-sided plane figure
- quadrilateralFour-sided closed figure
- pentagonFive-sided closed figure
- hexagonSix-sided closed figure
octagon · nonagon · decagon · dodecagon · parallelogram · rhombus · trapezoid · equilateral · isosceles · scalene
transversal
Line crossing multiple others
- correspondingMatching in character
- alternateOccur in succession
- parallelEquidistant at all points
angle, internal, interior, exterior, angles, internally, internalize, interiors, internalization