PRESENTATION OUTLINE
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Acute angle- an angle that is more than 0 degrees, but less than 90 degrees.
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Obtuse angle-An angle that measures less than 180 degrees but more than 90 degrees.
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Right angle-an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.
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Straight angle- an angle of 180 degrees.
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Vertical Angle-a pair of non-adjacent angles formed when two lines intersect.
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Adjacent angles-two angles that have a common vertex and a common side.
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Complementary angle-either of two angles whose sum is 90°.
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Supplementary angle-either of two angles whose sum is 180°.
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Corresponding Angles-angles that occupy the same relative position at each intersection where a straight line crosses two others.
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Transversal-intersecting a system of lines.
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Acute Triangle- all angles are less than right angles—each one is less than 90 degrees. An acute triangle may be equilateral, isosceles, or scalene.
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Right triangles-a triangle with a right angle.
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Obtuse triangles- a triangle in which one of the angles is an obtuse angle.
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Scalene Triangles-triangles where each side is a different length.
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Isosceles Triangles-a triangle that has two sides of equal length.
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Equilateral Triangles-a triangle in which all three sides are equal.
