Polygons
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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acute triangle | A triangle with all angles measures less than 90 degrees.
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isosceles triangle | A triangle with at least two congruent sides; two side lengths are the same.
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right triangle | A triangle with one 90 degree angle.
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scalene triangle | A triangle that has NO congruent sides; all side lengths are different.
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equilateral triangle | A triangle with three congruent sides; all side lengths have the same measure.
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obtuse | A triangle with one obtuse angle; one angle measure is greater than 90 degrees.
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triangle | A three sided polygon.
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triangle sum theorem | The theorem which states that the angles measures of any triangle must have a sum of 180 degrees; the angles of a triangle add up to 180 degrees.
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leg | In a right triangle, the legs are the two sides which create the right angle; the perpendicular line segments.
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hypotenuse | In a right triangle, the side opposite the right angle; the longest side in a right triangle. The side of the triangle that is does not create the right angle.
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triangle inequality | The rule that says the smallest side length plus the medium side length must have a sum greater than the largest side length. Small + Medium > Large
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3 sided shape | triangle
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4 sided shape | quadrilateral
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5 sided shape | pentagon
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6 sided shape | hexagon
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7 sided shape | septagon or heptagon
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8 sided shape | octagon
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9 sided shape | nonagon
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10 sided shape | decagon
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11 sided shape | hendecagon or an 11-gon
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12 sided shape | dodecagon
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15 sided shape | pentadecagon
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Sum of the interior angles of a polygon | (n-2) x 180 where n is the number of sides on the polygon
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Number of triangles formed when a polygon is divided into triangles using diagonals (triangulation) | n-2 (n is the number of sides)
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The measure of each interior angle of a regular polygon | Sum of the interior angles / number of sides
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Triangulate or Triangulation | The process of dividing a polygon into triangles by drawing its diagonals
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Polygon | A closed plane figure created by three or more line segments that intersect only at their endpoints (vertices)
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Regular Polygon | A polygon with congruent sides and angles
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Congruent | Having the same size and shape
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Created by:
theboss1000
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