Chapter 7 · Class 7 CBSE · Formula Sheet
Triangles & Angle Properties Formulas — Class 7 CBSE
Classify triangles, explore angle sum property, and understand exterior angles.
Key Formulas
Angle Sum Property
\angle A + \angle B + \angle C = 180°
Exterior Angle Theorem
\text{Exterior angle} = \text{Sum of two non-adjacent interior angles}
Triangle Inequality
a + b > c, \quad b + c > a, \quad a + c > b
Equilateral Triangle
\text{All sides equal, each angle} = 60°
Isosceles Triangle
\text{Two equal sides, base angles are equal}
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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