Mathematics — first biennium · Lesson
First identify the geometric relation, then use it to determine the missing measure.
In this lesson: Recognize angle relations and calculate measures using complementary, supplementary and vertically opposite angles.
How to proceed: First recognize that the angles are vertically opposite; then use that property for the calculation.
You can already assume: Point, line, ray and segment.
Completed exercises: 0/5 · Correct on first attempt: 0
First recognize that the angles are vertically opposite; then use that property for the calculation.
One angle measures 105°. The other is marked ?.
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.
Relationships: solid line = required · dashed line = recommended · dotted line = reinforcement.