Which is not true about adjacent angles?
A They are coplanar.
B They share a common side.
C They have no interior points in common.
D They have the same measure.
draw two adjacent angles. I think the answer will be clear. If not, which statements do you know are true?
To determine which statement is not true about adjacent angles, let's examine each option:
A) "They are coplanar." - This statement is true, as adjacent angles are always in the same plane.
B) "They share a common side." - This statement is also true. Adjacent angles are formed by two intersecting lines, and the common side is the one they share.
C) "They have no interior points in common." - This statement is not true. Adjacent angles have an interior point in common, which is the point where the two lines intersect.
D) "They have the same measure." - This statement is often true but not always. Adjacent angles can have different measures, but they are always supplementary, meaning their measures add up to 180 degrees.
Therefore, the answer is option C - "They have no interior points in common," as it is not true about adjacent angles.