Q1
What forms an angle?
ATwo rays sharing a common endpoint
BA single ray
CA single point
DA closed shape
SSCClass 6 (SSC)Mathematics (गणित)Ch 2 · Topic 1
Angles
An angle is formed when two rays share a common endpoint, and understanding angle types and measurement is fundamental to geometry.
Core concept
An angle is measured in degrees, formed by two rays meeting at a common point called the vertex.
How it works
Angles are classified as acute (less than 90°), right (exactly 90°), obtuse (between 90° and 180°), and straight (exactly 180°).
Why it matters
A protractor is used to measure angles accurately, placing its centre at the vertex and reading the degree measurement.
Key detail
Understanding angles is essential for studying shapes, triangles, and various real-world applications like construction and design.
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• Angle: formed by two rays, common endpoint (vertex).
• Measured in degrees.
• Acute: less than 90°.
• Right: exactly 90°.
• Obtuse: 90° to 180°.
• Straight: exactly 180°.
• A protractor measures angles.
• Angles matter for shapes, construction, design.