Unit 5 · Class 7 IB MYP · Formula Sheet
Angle Relationships Formulas — Class 7 IB MYP
Explore complementary, supplementary, and vertically opposite angles with parallel lines.
Key Formulas
Vertically Opposite
\text{Equal}
Supplementary
\angle 1 + \angle 2 = 180°
Angles on Parallel Lines
\text{Corresponding} = \text{equal}, \quad \text{Alternate} = \text{equal}, \quad \text{Co-interior sum} = 180°
Worked Examples
1Using: Supplementary Angles
If one angle is 65 degrees, find its supplement.
Step 1: Supplement = 180 - 65
Step 2: = 115 degrees.
Answer: 115 degrees
2Using: Vertically Opposite
Two lines intersect. If one angle is 40 degrees, find the vertically opposite angle.
Step 1: Vertically opposite angles are equal.
Step 2: The angle = 40 degrees.
Answer: 40 degrees
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