Chapter 8 · Class 7 ICSE · Formula Sheet

Lines & Angles Formulas — Class 7 ICSE

Study pairs of angles, parallel lines with a transversal, and angle sum properties.

Key Formulas

Corresponding Angles

\text{Equal when lines are parallel}

Alternate Interior Angles

\text{Equal when lines are parallel}

Co-interior Angles

\text{Sum} = 180° \text{ when lines are parallel}

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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Frequently Asked Questions

How many formulas are in Class 7 ICSE Lines & Angles?+
There are 3 formulas in the Lines & Angles chapter for Class 7 ICSE. Each formula is essential for solving problems in this topic.
How to remember Lines & Angles 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 Lines & Angles formulas enough for exams?+
Yes, these formulas cover the complete ICSE Class 7 syllabus for Lines & Angles. Practice applying them to different types of questions for full exam readiness.

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