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An Angle in GeometryAn angle is the rotation required to superimpose one of two intersecting lines on the other.
A Right AngleA right angle is an angle with measure equal to 90 degrees.
An Acute AngleAn acute angle is an angle with a measure between 0 and 90 degrees.
An Obtuse AngleAn obtuse angle is an angle with a measure between 90 and 180 degrees.
Complementary AnglesTwo angles are complementary if the sum of their measures is equal to 90 degrees. Example: angles a and b with measures a = 19o and b = 71o are complementary since a + b = 90o
Supplementary AnglesTwo angles are supplementary if the sum of their measures is equal to 180 degrees. Example: angles a and b with measures a = 122.1o and b = 57.9o are supplementary since a + b = 180o
Exercises(see solutions below) Given angles a, b, c, d, e and f with measuresa = 21o b = 90.1o c = 90o d = 134.2o e = 69o f = 45.8o 1 - Which of these angles are acute? 2 - Which of these angles are obtuse? 3 - Which pairs of angles are complementary? 4 - Which pairs of angles are supplementary?
Solutions to Above Exercises1 - a, e and f 2 - b and d. 3 - a - e 4 - d - f More geometry references Geometry Tutorials, Problems and Interactive Applets. |