the edge
The distance from one side to the other
passing through the centreThe red line
The blue line
Tangent Degree Chord Sector Segment Diameter Sphere Concentric Arc
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Tangent Degree Chord Sector Segment Diameter Sphere Concentric Arc
Where can you see i) a segment ii) a sector iii) an arc?
Sector
Segment
An ARC is the name for part of the circumference
Angle in a semi-circle = 90°
a + b = 180°
Opposite angles in a cyclic quadrilateral add up to 180°
b
c
d
a