All Basic Geometry Resources
Example Questions
Example Question #21 : How To Find An Angle Of A Line
If lines A and B are parallel, what is the measurement of ?
and the given angle are supplementary, meaning that their angle measurements add up to .
Subtracting 78 from each side to find the measurement of angle two.
Example Question #22 : How To Find An Angle Of A Line
If lines A and B are parallel, find the measurement for .
and the given angle are supplementary, meaning that their angle measurements add up to .
Subtract 78 from both sides to find the measurement of angle 3.
Example Question #23 : How To Find An Angle Of A Line
If lines A and B are parallel, what is the measurement for ?
When parallel lines are cut by a transversal, vertical angles are congruent.
The given angle and are vertical angles.
must also have the same mesaurement as the given angle.
Example Question #24 : How To Find An Angle Of A Line
If lines A and B are parallel, what is the measurement of angle 5?
Notice that and are supplementary, meaning their angle measurements add up to .
Now, notice that and the given angle are corresponding angles, meaning that their measurements are the same.
Thus,
Example Question #1572 : Plane Geometry
If lines D and E are parallel, what is the measure of ?
The given angle and are supplementary, meaning their angle measurements add up to .
Subtract 127 from both sides to find the measurement of angle seven.
Example Question #25 : How To Find An Angle Of A Line
If lines D and E are parallel, what is the measure of ?
The given angle and are interior consecutive angles, meaning they add up to .
Subtract 127 from both sides to find the measurement of angle eight.
Example Question #26 : How To Find An Angle Of A Line
If lines D and E are parallel, what is the measure of ?
The given angle and are corresponding angles. Corresponding angles share the same value.
must then be equal to the given value.
Therefore,
Example Question #27 : How To Find An Angle Of A Line
If lines D and E are parallel, what is the measure of ?
The measure of cannot be determined.
The given angle and are vertical angles. Vertical angles are congruent.
must have the same measure as the given angle.
Therefore,
Example Question #28 : How To Find An Angle Of A Line
If lines D and E are parallel, what is the measure of ?
The given angle and are alternative interior angles. Alternate interior angles are congruent.
must have the same measure as the given angle.
Example Question #29 : How To Find An Angle Of A Line
If lines D and E are parallel, what is the measure of ?
The given angle and are supplementary, meaning that their values must add up to .
Subtract 127 from both sides to find the measurement of angle twelve.