Angle Relationships Flashcards

Grade 7 · Math · Flashcards

Key angle vocabulary and relationships for 7th grade geometry.

Flashcards

Complementary angles: Two angles whose measures add up to 90°. Example: 35° and 55°
Supplementary angles: Two angles whose measures add up to 180°. Example: 110° and 70°
Vertical angles: Opposite angles formed when two lines intersect; they are always congruent (equal)
Adjacent angles: Angles that share a vertex and a common side but do not overlap
Right angle: An angle measuring exactly 90°
Straight angle: An angle measuring exactly 180°; forms a straight line
Complement of an angle: Found by subtracting the angle from 90°: complement = 90° − angle
Supplement of an angle: Found by subtracting the angle from 180°: supplement = 180° − angle
Acute angle: An angle measuring less than 90°
Obtuse angle: An angle measuring more than 90° but less than 180°