Chapter 8 · Class 6 ICSE · Formula Sheet
Basic Geometry (Points, Lines & Angles) Formulas — Class 6 ICSE
Learn about points, lines, rays, segments, and types of angles with geometric constructions.
Key Formulas
Complementary Angles
\angle A + \angle B = 90°
Supplementary Angles
\angle A + \angle B = 180°
Vertically Opposite Angles
\text{Equal in measure}
Angles on a Line
\angle 1 + \angle 2 = 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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