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Angle
Geometric shape formed by two rays (initial and ending sides of the angle) that share a common endpoint called the vertex. You may name an angle using the vertex, or a point in each ray and the vertex label in the center.
Acute angle
An angle that is between 0 and 90 degrees.
Complement
Angle that together with the given angle adds up to 90 degrees.
Complementary angles
Two angles whose measures, when added together, equal 90 degrees.
Obtuse angle
An angle whose measure is greater than 90 but less than 180 degrees.
Supplement
Angle that together with the given angle adds up to 180 degrees.
Supplementary angles
Two angles whose measures, when added together, equal 180 degrees.
Vertical angles
Nonadjacent angles that are opposite by the vertex and are formed by two intersecting straight lines. |
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Drag point C within the shaded area to view different sets of complementary angles.
For this applet drag Point C to generate different sets of supplementary angles.
This applet also illustrates what a linear pair is.
Drag point C, verify how these vertical angles are congruent.
