Unit 6 · Class 6 IB MYP · Formula Sheet
Geometry Basics Formulas — Class 6 IB MYP
Identify and classify angles, lines, triangles, and quadrilaterals in the plane.
Key Formulas
Angle Types
\text{Acute} < 90°, \quad \text{Right} = 90°, \quad \text{Obtuse}: 90° - 180°
Triangle Angle Sum
\angle A + \angle B + \angle C = 180°
Quadrilateral Angle Sum
\text{Sum of angles} = 360°
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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