Simple Math Lab
Interactive Geometry & 3D Shape Learning Tool
β·
Parts of a Circle
⬑
2D Shapes
β
3D Shapes
Parts of a Circle
Centre
Radius
Diameter
Circumference
Chord
Arc
Sector
Segment
Tangent
Secant
Definitions
Select a part from the sidebar to learn more.
Centre:
The fixed point in the middle of the circle.
Radius:
A line segment from the centre to the circle.
Diameter:
A line segment passing through the centre and joining two points on the circle.
Circumference:
The boundary or outer edge of the circle.
Chord:
A line segment joining any two points on the circle.
Arc:
A part of the circumference.
Sector:
A region enclosed by two radii and an arc.
Segment:
A region enclosed by a chord and an arc.
Tangent:
A line that touches the circle at exactly one point.
Secant:
A line that cuts the circle at two points.
Triangle
cm
m
mm
in
π± Drag vertices to modify angles
Toggle Display
Adjust Dimensions
Scalene (Free Drag)
Equilateral
Isosceles
Right-angled
Custom Angles
Math Error: Interior angles must sum to exactly 180Β°!
Angle A (Β°)
Angle B (Β°)
Angle C (Β°)
Cube
π± Drag to rotate Β· Scroll to zoom
Adjust Dimensions
Fold Net
100%