what is angle by sector
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It is the angle that is inside the shape.
The Greek root meaning angle or corner is "gonia."
An obtuse angle is an angle of more than 180 degrees.
-- an angle that measures 90 degrees -- an angle whose sides are mutually perpendicular
Flexing is the medical term meaning decreasing an angle as in bending a joint.
Oblique means slanted or at an angle.
degrees
It is the angle between the cutting edges.It is usually 118 degrees
An angle of 90 degrees is commonly referred to as a right angle - deriving from the Latin words "angulus rectus", meaning "upright angle", this is in fact what the words "right angle" refer to.
A triangle with one right angle.
All triangles have three sides. Hence "tri" meaning three and "angle" meaning... angle. Three angles. Three sides. All triangles have these.