Q1
What is the radius?
ADistance from centre to any point on the circle
BThe full circle's circumference
CTwice the diameter
DA type of chord only
SSCClass 10 (SSC)Mathematics - Geometry (भूमिती)Ch 3 · Topic 2
Practice and Revision - Circle
Let us practise and revise what we learned about circle. A circle is a set of points equidistant from a centre point, and understanding its
Core concept
The radius is the distance from the centre to any point on the circle, while the diameter is twice the radius, passing through the centre.
How it works
A chord is a line segment connecting two points on a circle, with the diameter being the longest possible chord.
Why it matters
An arc is a part of the circle's circumference, and the angle subtended by an arc at the centre relates to its length.
Key detail
Tangent lines touch a circle at exactly one point, and are always perpendicular to the radius at that point of contact.
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Quick notes
• Radius: centre to circle point distance.
• Diameter: twice radius, through centre.
• Chord: line segment connecting two circle points.
• Diameter is the longest possible chord.
• Arc: part of circle's circumference.
• Angle subtended relates to arc length.
• Tangent: touches circle at one point.
• It's perpendicular to radius at that point.