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Example Questions
Example Question #1 : Angle Geometry
Refer to the above figure. You are given that .
Which two angles must be complementary?
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and form a linear pair, so their measures add up to that of a straight angle, which is . They must be supplementary (and cannot be complementary).
and are a pair of vertical angles - angles formed from a pair of intersecting lines which together have the lines as the union. They must be congruent, and need not be complementary.
and are a pair of same-side interior angles formed by transversal across the parallel lines. They must be supplementary (and cannot be complementary).
and are the acute angles of right triangle . They must be complementary. This is the correct pair.
Example Question #2 : Angle Geometry
Angles A and B are complementary angles. The measure of angle A is , The measure of Angle B is . find the value of .
Since angles A and B are complementary, their measures add up to 90 degrees. Therefore we can set up our equation as such:
-or-
Combine like terms and solve for :
Example Question #3 : Angle Geometry
What is the measure of an angle that is complementary to an angle measuring ?
The sum of complementary angles is equal to .
Set up the following equation and solve for :
Example Question #4 : Complementary Angles
Angles A and B are complementary angles. The measure of angle A is . The measure of angle B is . Solve for .
Since angles A and B are complementary angles, their measurements add up to equal 90. Therefore, we need to set up our equation as follows:
-or-
Combine like terms:
And solve for :
Example Question #4 : Complementary Angles
Angles A and B are complementary angles. The measure of angle A is . The measure of angle B is . What are the measures of the two angles?
No solution
Since angles A and B are complementary, their measures add up to equal 90 degrees. Therefore we can set up an equation as follows:
-or-
Combine like terms and solve for :
Now that we have found , we need to plug that back in to the two angle measurements
Example Question #3 : Complementary Angles
What angle is complementary to 55?
The definition of a complementary angle means that two angles must add up to 90 degrees.
To find the angle, simply subtract 55 from 90.
The answer is:
Example Question #5 : Complementary Angles
What angle is complementary to 10 degrees?
Complementary angles must add up to ninety.
Subtract the given angle from 90 to find the other angle.
The answer is:
Example Question #5 : Angle Geometry
Suppose the angles and are complementary angles. What is the value of ?
Set up the equation such that both angles sum up to 90.
Add 5 on both sides.
Divide both sides by 8.
The value of is:
The answer is:
Example Question #6 : Angle Geometry
Determine the value of if the angles and are complementary.
Complementary angles must add up to 90 degrees.
Set up an equation so that the sum of two angles add up to 90.
Subtract 8 on both sides.
Simplify both sides.
Divide by two on both sides.
The answer is:
Example Question #8 : Angle Geometry
What angle is complementary to radians?
Note that this is in radians. Recall that 2 complementary angles must add up to 90 degrees.
Since ,
To find the complementary angle, subtract from .
The answer is:
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