Chapter 9 · Class 7 ICSE · Formula Sheet

Triangles Formulas — Class 7 ICSE

Classify triangles, understand angle sum property, and explore triangle inequality.

Key Formulas

Angle Sum

\angle A + \angle B + \angle C = 180°

Exterior Angle

\text{Exterior} = \text{Sum of remote interior angles}

Triangle Inequality

a + b > c

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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More Class 7 ICSE Formulas

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Frequently Asked Questions

How many formulas are in Class 7 ICSE Triangles?+

There are 3 formulas in the Triangles chapter for Class 7 ICSE. Each formula is essential for solving problems in this topic.

How to remember Triangles formulas easily?+

Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.

Are these Triangles formulas enough for exams?+

Yes, these formulas cover the complete ICSE Class 7 syllabus for Triangles. Practice applying them to different types of questions for full exam readiness.

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