Seventh graders learn how angles relate — complementary angles add to 90°, supplementary to 180°, and vertical angles are equal — and use these rules to find missing angle measures.
Students will be able to…
When two lines cross, or two angles sit side by side, their measures are connected by hidden rules. What are those relationships, and how do they help you find a missing angle?
Project this and tap each angle relationship. Have students learn to spot complementary, supplementary, and vertical angles!
Tap any phase to open the teacher moves and student actions.
When two lines cross, the angles are connected — how?
Teacher models.
Class uses the Angle Explorer.
Students find angles.
One figure.
Aligned to the Common Core State Standards for Mathematics.
Use facts about angle relationships to write and solve equations for unknown angles.
Identify complementary, supplementary, vertical, and adjacent angles.
Draw geometric figures with given conditions.
Use angle structure to find unknowns.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students write and solve equations for missing angles, like “x + 40° = 90°.” A printable angle-relationships sheet is in the Math library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.