Triangles
ICSE · Class 7 · Mathematics
All formulas from Triangles in ICSE Class 7 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
2. Angle Properties
Sum of interior angles of a triangle = 180°
Exterior Angle Theorem: Exterior angle = sum of its two interior opposite angles
Exterior angle + Interior angle = 180°
Ratio Method for Triangle Angles: Angles = (5/12) × 180°, (3/12) × 180°, (4/12) × 180°
4. Solved Question Patterns
x + x + 40° = 180°
x + 65° + 65° = 180°
x + 2x + 2x = 180°
5x + 3x + 4x = 180°
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