Q1
What is a line segment?
AA line with two endpoints
BA line with one endpoint
CA line with no endpoints
DA curved shape
ICSEClass 7 (ICSE)MathematicsCh 13 · Topic 1
Lines and Angles (Including Construction of Angles)
Lines and angles form the basis of geometry, and we can construct specific angles accurately using a protractor and compass.
Core concept
A line segment has two endpoints, a ray has one endpoint extending infinitely, and a line extends infinitely in both directions.
How it works
Angles are classified by their measure - acute (less than 90°), right (exactly 90°), obtuse (between 90° and 180°), and straight (180°).
Why it matters
We construct angles accurately using a protractor to measure the desired degree, or a compass for specific standard angles like 60°.
Key detail
Understanding lines and angles is fundamental for constructing shapes and solving geometric problems accurately.
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Quick notes
• A line segment has two endpoints.
• A ray has one endpoint, extends infinitely.
• A line extends infinitely both ways.
• Acute angles are less than 90°.
• Right angles are exactly 90°.
• Obtuse angles are between 90° and 180°.
• We use a protractor to construct angles.
• A compass helps construct standard angles like 60°.